Seems as if both the glich and elementalx kernels will not flash on secondary roms, they both use aroma as the installer. Was experimenting and tried to run the abootimg utility on my N7 to try and create the boot.img file but got a size mismatch error or something like it. I did notice that the zimage files for the 4.4 kernels are much larger than the 4.3 kernels could this be the problem? Does multirom have a problem with a larger file? 
GialanG
Senior Member
Seems as if both the glich and elementalx kernels will not flash on secondary roms, they both use aroma as the installer. Was experimenting and tried to run the abootimg utility on my N7 to try and create the boot.img file but got a size mismatch error or something like it. I did notice that the zimage files for the 4.4 kernels are much larger than the 4.3 kernels could this be the problem? Does multirom have a problem with a larger file?
It depends on whether you choose Share or Don't share kernel. The kernels work perfectly if you don't share with internal, you can simply install .zip files and run aroma as usual.
Exact same problem here. SlimKat as a secondary ROM, not sharing the kernel of the primary ROM. I go through the process of installing ElementalX 2.1, but when I boot into SlimKat, it's running its own kernel rather than ElementalX.
Sent from my Nexus 7 using Tapatalk
Sent from my Nexus 7 using Tapatalk
Seems as if both the glich and elementalx kernels will not flash on secondary roms, they both use aroma as the installer. Was experimenting and tried to run the abootimg utility on my N7 to try and create the boot.img file but got a size mismatch error or something like it. I did notice that the zimage files for the 4.4 kernels are much larger than the 4.3 kernels could this be the problem? Does multirom have a problem with a larger file?
Logs!
Code:
# Run after the installation fails on your PC and get me that file
adb pull /tmp/recovery.logHere is a log file from my attempt to install the elementalX ver 2.2 kernel.
Anyone else not able to get ART working? I'll select it and on reboot it just goes back to dalvik.
Sent from my Nexus 7 using Tapatalk
Sent from my Nexus 7 using Tapatalk
xanthrax
Retired Senior Moderator - Vampire
ART shouldn't be related to multi boot
But is working fine for the internal ROM
sent from my Darkside of Nexus 4
It's gotta be due to Mult boot. It happens on both roms and only when multi boot is installed. My internal rom is stock. When you enable ART it asks you to reboot, so I'll hit ok. It reboots fine, but when I check it is still dalvick. Anyone else with this issue?
xanthrax
Retired Senior Moderator - Vampire
I have ART running on the SlimKat rom as a secondary with no problems. When I did the switch over it did a reboot and updated the apps then started up with no issues. Do you have gapps loaded that are for ART?
Not sure what the beef is, I'll start over. I'll keep everyone posted.
Sent from my Nexus 7 using Tapatalk
Sent from my Nexus 7 using Tapatalk
Please help!
I am using Official Kitkat (android 4.4) with franco kernel. I want to use SlimBean rom (android 4.3) as my secondary rom? Is it possible???
If it can be possible, Do I need to flash kernel for my secondary rom? And how???
Please tell me anyone. :crying:
I am using Official Kitkat (android 4.4) with franco kernel. I want to use SlimBean rom (android 4.3) as my secondary rom? Is it possible???
If it can be possible, Do I need to flash kernel for my secondary rom? And how???
Please tell me anyone. :crying:
GialanG
Senior Member
I am using Official Kitkat (android 4.4) with franco kernel. I want to use SlimBean rom (android 4.3) as my secondary rom? Is it possible???
If it can be possible, Do I need to flash kernel for my secondary rom? And how???
Please tell me anyone. :crying:
Yes you can, just remember not to share kernel
Sent from my Nexus 7 using Tapatalk
MultiRom Usb Driver NTFS Format
Hello Guys!I have a usb driver and i formatit on my computer with ntfs.After doing that i install costum rom and gapps with succes but after rebooting multirom does`n fiind rom on usb driver.I was waiting for 2-3 minute without result.Because of that i try to format my usb drive but this time with fat32 and after i installed costum rom the multirom has find my usb driver and was abble to boot.My question is if multirom working with ntfs file?Thank You!
Hello Guys!I have a usb driver and i formatit on my computer with ntfs.After doing that i install costum rom and gapps with succes but after rebooting multirom does`n fiind rom on usb driver.I was waiting for 2-3 minute without result.Because of that i try to format my usb drive but this time with fat32 and after i installed costum rom the multirom has find my usb driver and was abble to boot.My question is if multirom working with ntfs file?Thank You!
Hi @Tasssadar
I'm thinking of installing this. but one thing I noticed was that the TWRP in the OP is 2.6.3.0, while the latest TWRP is 2.6.3.1... are you planning on recompiling the recovery anytime soon? Then I might wait for you to do that.
Also, wanted a bit of a clarification... Let's say I keep AOSP as my base, and I install CM11 on MultiROM... what kernel will the CM install use? Will it rely on my AOSP kernel, or use the CM kernel bundled with the ROM?
Edit: No need to answer that second question. Noob me. ^_^
I'm thinking of installing this. but one thing I noticed was that the TWRP in the OP is 2.6.3.0, while the latest TWRP is 2.6.3.1... are you planning on recompiling the recovery anytime soon? Then I might wait for you to do that.
Also, wanted a bit of a clarification... Let's say I keep AOSP as my base, and I install CM11 on MultiROM... what kernel will the CM install use? Will it rely on my AOSP kernel, or use the CM kernel bundled with the ROM?
Edit: No need to answer that second question. Noob me. ^_^
Last edited:
HY @Tasssadar
Big Thx for your hard work! MultiRom works great on my Nexus 7 LTE!!!
I have one question, its possible to get Ubuntu Desktop on our Nexus?
Big Thx for your hard work! MultiRom works great on my Nexus 7 LTE!!!
I have one question, its possible to get Ubuntu Desktop on our Nexus?
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170Introduction
MultiROM is one-of-a-kind multi-boot mod for Nexus 7. It can boot any Android ROM as well as other systems like Ubuntu Touch, once they are ported to that device. Besides booting from device's internal memory, MultiROM can boot from USB drive connected to the device via OTG cable. The main part of MultiROM is a boot manager, which appears every time your device starts and lets you choose ROM to boot. You can see how it looks on the left image below and in gallery. ROMs are installed and managed via modified TWRP recovery. You can use standard ZIP files to install secondary Android ROMs and MultiROM even has its own installer system, which can be used to ship other Linux-based systems.
Features:
* Multiboot any number of Android ROMs
* Restore nandroid backup as secondary ROM
* Boot from USB drive attached via OTG cable
You can also watch a video which shows it in action.
Warning!
It _is_ dangerous. This whole thing is basically one giant hack - none of these systems are made with multibooting in mind. It is no longer messing with data partition or boot sector, but it is possible that something goes wrong and you will have to flash factory images again. Make backups. Always.
Installation
1. Via MultiROM Manager app
This is the easiest way to install everything MultiROM needs. Install the app and select MultiROM and recovery on the Install/Update card. If the Status card says Kernel: doesn't have kexec-hardboot patch! in red letters, you have to install also patched kernel - either select one on the Install/Update card or get some 3rd-party kernel here on XDA. You are chosing kernel for your primary ROM, not any of your (future) secondary ROMs, so select the version accordingly.
Press "Install" on the Install/Update card to start the installation.
2.Manual installation
Firstly, there are videos on youtube. If you want, just search for "MultiROM installation" on youtube and watch those, big thanks to all who made them. There is also an awesome article on Linux Journal.
MultiROM has 3 parts you need to install:
- MultiROM (multirom-YYYYMMDD-vXX-flo.zip) - download the ZIP file from second post and flash it in recovery.
- Modified recovery (TWRP_multirom_flo_YYYYMMDD.img) - download the IMG file from second post and use fastboot or Flashify app to flash it.
- Patched kernel - You can use either one of the stock ones in second post or third-party kernels which include the patch, you can see list in the second post. Download the ZIP file and flash it in recovery.
Download links are in the second post.
MultiROM is compatible with both flo and deb.
Adding ROMs
1. Android
Go to recovery, select Advanced -> MultiROM -> Add ROM. Select the ROM's zip file and confirm. As for the space, clean installation of stock 4.2 after first boot (with dalvik cache generated and connected to google account) takes 676mb of space.
2. FirefoxOS
Download FirefoxOS ZIP package from this thread. The installation is completely the same as Android ROMs.
3. Ubuntu Touch
Use the MultiROM Manager app to install Ubuntu Touch.
Ubuntu Touch is in development - MultiROM will have to be updated to keep up with future changes in Ubuntu, so there's a good chance this method stops working after a while and I'll have to fix it.
Using USB drive
During installation, recovery lets you select install location. Plug in the USB drive, wait a while and press "refresh" so that it shows partitions on the USB drive. You just select the location (extX, NTFS and FAT32 partitions are supported) and proceed with the installation.
If you wanna use other than default FAT32 partition, just format it in PC. If you don't know how/don't know where to find out how, you probably should not try installing MultiROM.
If you are installing to NTFS or FAT32 partition, recovery asks you to set image size for all the partitions - this cannot be easilly changed afterward, so choose carefully. FAT32 is limited to maximum of 4095MB per image - it is limitation of the filesystem, I can do nothing about that.
Installation to USB drives takes a bit longer, because the flash drive is (usually) slower and it needs to create the images, so installation of Ubuntu to 4Gb image on my pretty fast USB drive takes about 20 minutes.
Enumerating USB drive can take a while in MultiROM menu, so when you press the "USB" button in MultiROM, wait a while (max. 30-45s) until it searches the USB drive. It does it by itself, no need to press something, just wait.
Updating/changing ROMs
1. Primary ROM (Internal)
- Flash ROM's ZIP file as usual, do factory reset if needed (it won't erase secondary ROMs)
- Go to Advanced -> MultiROM in recovery and do Inject curr. boot sector.
2. Secondary Android ROMs
If you want to change the ROM, delete it and add new one. To update ROM, follow these steps:
- Go to Advanced -> MultiROM -> List ROMs and select the ROM you want to update.
- Select "Flash ZIP" and flash ROM's ZIP file.
Source code
MultiROM - https://github.com/Tasssadar/multirom/tree/master (branch master)
Modified TWRP - https://github.com/Tasssadar/Team-Win-Recovery-Project (branch master)
Kernel w/ kexec-hardboot patch - https://github.com/Tasssadar/android_kernel_google_msm
Crowdfunding campaign
A crowdfunding campaign to get test devices took place from July 28th to August 27th 2013. Thanks all contributors, the campaign was successful, raising a total of $562. This enabled a purchase of flo and resulted in MultiROM being ported to said device and the code became much more portable.
These people pledged $10 or more and got perk "The Thread" or "The Code":
- flash5000
- Bibi
- jbaumert
- viper08
- marius15
- x.nicow.x
- Ben Hagen
- magedragon25
- JonathanWardRogers
- theperson88
- Sean Smith
- sabinblitz
Donations
I'd be glad if you could spare a few bucks. You can use either paypal or Bitcoins, my address is 172RccLB2ffSnJyYwjYbUD3Nx4QX3R8Ris
Thanks to all donors, it is much appreciated65Downloads
1. Main downloads
MultiROM: multirom-20160207-v33-flo.zip
Modified recovery (based on TWRP): TWRP_multirom_flo_20160210.img (flo) or TWRP_multirom_deb_20160210.img (deb)
MultiROM Manager Android app: Google Play or link to APK
Kernel w/ kexec-hardboot patch (Stock 4.3): kernel_kexec_flo_430-2.zip
Kernel w/ kexec-hardboot patch (Stock 4.4): kernel_kexec_flo_440.zip
Kernel w/ kexec-hardboot patch (Stock 4.4.1 and 4.4.2): kernel_kexec_flo_441.zip
Kernel w/ kexec-hardboot patch (Stock 4.4.3 and 4.4.4): kernel_kexec_flo_443.zip
Kernel w/ kexec-hardboot patch (Stock L preview): kernel_kexec_flo_L.zip
Kernel w/ kexec-hardboot patch (Stock 5.0 preview (LPX13D)): kernel_kexec_flo_50_lpx13d.zip
Kernel w/ kexec-hardboot patch (Stock 5.0): kernel_kexec_flo_50_final.zip
Kernel w/ kexec-hardboot patch (Stock 5.0.1 and 5.0.2): kernel_kexec_flo_501.zip
Kernel w/ kexec-hardboot patch (Stock 5.1): kernel_kexec_flo_510-2.zip
Kernel w/ kexec-hardboot patch (Stock 5.1.1): kernel_kexec_flo_511-3.zip
Kernel w/ kexec-hardboot patch (Stock 6.0 and 6.0.1): kernel_kexec_flo_601.zip
Kernel w/ kexec-hardboot patch (CM 10.2 - old): kernel_kexec_flo_cm102-3.zip
Kernel w/ kexec-hardboot patch (CM 10.2 - new): kernel_kexec_flo_cm102_new.zip
Kernel w/ kexec-hardboot patch (CM 11 (4.4 - 4.4.2)): kernel_kexec_flo_cm11-5-a7e944881c.zip
Kernel w/ kexec-hardboot patch (CM 11 (4.4.3 - 4.4.4)): kernel_kexec_flo_cm11-8-56220eb2ca.zip
Kernel w/ kexec-hardboot patch (CM 12): kernel_kexec_flo_cm12-1-791c990ed0.zip
Kernel w/ kexec-hardboot patch (CM 12.1): kernel_kexec_flo_cm121-01-ea9556ceb5.zip
Kernel w/ kexec-hardboot patch (CM 13.0): kernel_kexec_flo_cm13-01-b4a11dbae.zip
You need to have kernel with kexec-hardboot patch only in your primary ROM!
Mirror: http://d-h.st/users/tassadar
2. third-party kernels with kexec-hardboot patch
Glitch kernel (13/10/2013 or newer!) - http://xdaforums.com/showthread.php?t=2449919
ElementalX - http://xdaforums.com/showthread.php?t=2389022
franco.Kernel - http://xdaforums.com/showthread.php?t=2446431
TinyKernel - http://xdaforums.com/showthread.php?t=2383083
Nicely ask your kernel developer to merge kexec-hardboot patch.
3. Uninstaller
MultiROM uninstaller: multirom_uninstaller-flo-2.zip
Flash this ZIP file to remove MultiROM from your device. It will erase all secondary ROMs. If you don't want MultiROM menus in recovery, re-flash clean TWRP, but it is not needed - those menus don't do anything if MultiROM is not installed.
4. Flashable factory images ZIPs
I usually release flashable ZIP files based on new factory images from Google, so that you can have clean stock ROM as a secondary system in MultiROM. They are not rooted, no anything, except for occasional small tweaks to make rooting with SuperSU possible. You can find them in this folder on basketbuild or dev-host.
Changelog
Code:MultiROM v33 ===================== * Updates for Android 6.0 compatibility MultiROM v32a ===================== * Fix pattern encryption password incorrectly reporting "invalid password" when the pattern overlaps itself MultiROM v32 ===================== * Minor GUI improvements * Support for device encryption (with Android-based secondary ROMs only). See FAQ in this device's XDA thread for more info. * Bunch of ROM compatibility fixes MultiROM v31 ===================== * Add support for "multimount" fstabs * Support interlaced PNGs (fixes wrongly rendered icons in boot manager, e.g. the L icon) MultiROM v30 ===================== * Fix logs generated by the "emergency reboot" screen, they were incomplete MultiROM v29 ===================== * Implement "autoboot if no key pressed" mode - the boot manager won't show up unless you hold down a volume down button during boot. Must be enabled in recovery. * Android 5.0 preview related tweaks * Fix screen tearing MultiROM v28 ===================== * Fix freezes in the boot manager * You can now swipe between the tabs in the boot manager * Minor UI adjustments * SailfishOS support (for certain devices) MultiROM v27 ===================== * Redesign the boot manager GUI. Looks much better now. * Fix separate radio.img not working on Android L preview ROMs * Fix issues with unaccessible /sdcard on Android L preview. Do NOT run restorecon manually on /data/media, ever - it breaks MultiROM! * Workaround bug which caused franco.Kernel on N5 to break secondary ROM's boot * Update Ubuntu Touch init scripts * Use power+volume down (you have to press power first!) to save screenshots. They are now PNG images and are saved to /sdcard/Pictures/Screenshots/. MultiROM v26 ===================== * Fix boot into secondary ROM from the MultiROM Manager app broken in v25 MultiROM v25 ===================== * Add support for the Android L preview MultiROM v24 ===================== * Add F2FS support * Show icons in ROM list, configurable via MultiROM Manager app * Improve compatibility with different ROMs and kernels when booting a ROM from the Android app MultiROM v23 ===================== * Fix compatibility with Ubuntu Touch rev 290 and higher. If your Ubuntu installation won't boot, go to recovery and use "Re-patch init" option in Advanced -> MultiROM -> List ROMs -> *ubuntu*. MultiROM v22b ===================== * Fix excessive battery drain (~1%/hour, about 5x more) while in primary ROM caused by a bug in kernel drivers triggered by MultiROM. Read post #465 on XDA forums for more info - [url]http://bit.ly/xda-flo-drain[/url] MultiROM v22a ===================== * Mount the real /data partition to folder /android/realdata in Ubuntu Touch, enabling sharing data between Android and Ubuntu Touch. See [url]http://bit.ly/ut_sharing[/url] for more info. MultiROM v22 ===================== * Fix linux-type ROMs (Ubuntu Touch) failing to boot for some users MultiROM v21a ===================== * Add support for testing builds of Ubuntu Touch (see XDA thread, post #308) MultiROM v21 ===================== * Revert "mount /system in secondary ROMs read-only" - if done so, SuperSU breaks the boot. MultiROM v20 ===================== * Support booting ROMs directly from Manager App * Fix FCs on CyanogenMod-based ROMs * Fix support for USB drives formatted with NTFS, broken in v17 * Mount /system in secondary ROMs read-only MultiROM v19 ===================== * Implement "boot the last ROM" auto-boot type MultiROM v18 ===================== * Fix silent-but-unpleasant crash with exFAT MultiROM v17 ===================== * Changes to support MultiROM Manager app * Add support for exFAT MultiROM v16 ===================== * Add overscroll bounceback effect to rom list * Add support for controling via physical keys * Bunch of under-the-hood changes for mako and m7 support MultiROM v15a ===================== * Fix bootloop after flashing on certain kernels. Update your kexec-hardboot kernel! MultiROM v15 ===================== * Initial version
Recoveries:
Code:10.2.2016 ===================== * Fix ZIP selector being set to wrong storage after flashing ZIP to a secondary ROM 9.2.2016 ===================== * Fix confusing "Unable to mount..." error message * Fix flashing of some kernels into secondary ROMs * Fix ubuntu touch support 6.2.2016 ===================== * Update to TWRP 3.0.0 (big thanks to nkk71 for doing most of the work) * Use Material theme made by z31s1g - thanks! * Fixes for 6.0 compatibility * Fixes for SuperSU compatibility. Use BETA 2.67-20160203160253 ( [url]http://bit.ly/m_su[/url] ) or newer! 30.6.2015 ===================== * Update to TWRP 2.8.7 * Add option to duplicate secondary ROM into "Swap ROMs" section 10.4.2015 ===================== * Fix Ubuntu Touch installation broken in previous update 6.4.2015 ===================== * Fix support for SuperSU 2.47 Beta and higher 28.3.2015 ===================== * Update to TWRP 2.8.6 * Added "restorecon" option to secondary ROMs (in MultiROM -> List ROMs), should be used to fix broken SELinux contexts, which can be causing bootloops of secondary ROMs * Bunch of ROM compatibility fixes - recovery now uses entirely new way to inject ZIP installation files, which should be much more robust and reliable * Big ZIPs (> 450MB) are no longer permanently modified when flashed as secondary ROMs * Fix sideloading of big ZIP files (> 450MB) into secondary ROMs 12.2.2015 ===================== * Update to TWRP 2.8.5 * Fix support for ROMs containing a supersu.zip in their installation file (e.g. AICP) 15.1.2015 ===================== * Fix "Swap ROMs" feature after the last update 14.1.2015 ===================== * Update to TWRP 2.8.4 * Lots of ZIP compatibility fixes (e.g. for CM 12) 15.11.2014 ===================== * Support for ZIP files which are using the new 'block_image_update' command (e.g. SimpleAOSP ROM) 29.10.2014 ===================== * Update to TWRP 2.8.1 21.10.2014 ===================== * Update autoboot settings for MultiROM v29 14.9.2014 ===================== * Update with changes from 2.8.0.1 upstream version: fix a bug that causes weird graphics glitches and touch issues 11.9.2014 ===================== * Update to TWRP 2.8.0 * Fix adding ROMs from backup to a FAT32 USB drives * Remove "share kernel with internal?" from "Add ROM" page, there is usually no reason to use it anymore and it might be confusing to figure out what it actually does. You can still get the same behavior by clicking "Remove boot.img" on the List ROMs -> *rom name* page. 21.8.2014 ===================== * Remove Ubuntu Touch installation, installing via recovery is deprecated * Add SailfishOS installation (only for supported devices) 8.8.2014 ===================== * Show secondary ROM's name in the title bar while executing it's script (e.g. during OTA update) * Update Ubuntu Touch updater * Fix failure to swap ROMs if it contains filenames starting with a dot * Fix add ROM from a backup producing unbootable ROM with Android L preview * Add option to remove radio.img from secondary ROMs * Add config options for MultiROM v27 5.6.2014 ===================== * Update to TWRP 2.7.1 * Hide misleading "Mount: Unable to find partition for path '/data'" message which appeared during secondary ROM installation, it is not _actually_ an error. 4.6.2014 ===================== * Fix installation of bigger (>350MB) ZIPs as secondary ROMs 12.5.2014 ===================== * Fix crash during settings loading, causing a bootloop with certain settings 11.5.2014 ===================== * Add F2FS support * Add tool to switch F2FS<->ext4 to Advanced menu * Fix problems with backups introduced by TWRP 2.7.0 8.3.2014 ===================== * Update to TWRP 2.7.0 * Remove "save" button from MultiROM settings page, it is saved automatically now 27.2.2014 ===================== * Support for system-image based (from the Manager app) Ubuntu Touch installation * Some rendering optimizations, resulting in noticeably higher FPS in recovery 4.2.2014 ===================== * Update to support latest Ubuntu Touch testing builds * Add support for mice connected via USB-OTG * Fixup scrollbar behaviour in file list 24.12.2013 ===================== * Fix installing ROMs to USB drive * Fix ZIP verification * Support ZIP verification for secondary ROMs 15.12.2013 ===================== * Support OTA updates on secondary ROMs (tested with omni) * Add "Swap ROMs" feature * Implement "boot the last ROM" auto-boot type * Many bugfixes 2.12.2013 ===================== * Fix support for abootimg-based kernel installers (fixes ElementalX and Glitch kernels) 10.11.2013 - 01 ===================== * Fix some mounting issues when using ntfs or exFAT 10.11.2013 ===================== * Add exFAT support * Support system-image based Ubuntu Touch installation * Support Ubuntu Touch OTA updates, if Ubuntu is installed via MultiROM manager app 22.10.2013 ===================== * Fix SuperSU reporting "failed" when flashed to secondary ROM and completely borking the MultiROM part for any subsequent uses of "Flash ZIP" or "Backup" option 16.10.2013 ===================== * Automatically inject boot sector with MultiROM after ZIP installation or ADB sideload. Can be turned off on "confirm flash" or "ADB sideload" pages. 12.10.2013 ===================== * Support 'adb sideload' when adding ROMs * Support rotation while using custom recovery theme 5.10.2013 ===================== * Don't display unsupported systems in "Add ROM" menu 28.9.2013 ===================== * Fix instalation of some ROMs with AROMA installer 25.9.2013 ===================== * Don't unmount /usb-otg after Adding ROM * Fix bootloop after injecting boot on certain kernels 24.9.2013 ===================== * Initial flo release46FAQ and other notes
Device encryption
Since v32, MultiROM supports encryption on this device (it has to be added for each device separately). It works only with Android-based secondary ROMs and the secondary ROMs don't know the device is encrypted, so they would allow you to encrypt the device again - do not do that. If you're using password, pin or pattern for the encryption, MultiROM will ask you for the password on boot. If you're booting the primary ROM, then Android will ask you for the password _again_ - unfortunately, there is no way for me to pass the "unencrypted" status to Android. If you're booting secondary ROM, MultiROM will ask you for the password again after the reboot - that's because I have to unencrypt the /data partition after the ROM's kernel is loaded.
I could omit the second password prompt when booting secondary ROM by temporarily saving the password somewhere, but that's obviously unsafe. So is using encryption with unlocked device though, so I might add this later.
About security
In order to make multi-booting possible, MultiROM has to sacrifice some security measures. Firstly, on secondary Android ROMs, /system is not mounted read-only. While there are other things preventing malicious software from messing with /system, this might potentialy make it easier for such software to attack that system.
What do the ROMs share?
All ROMs are separate, except /sdcard, which is shared between all Android ROMs.
How many ROMs can I have?/Where are the ROMs stored?
You can have as many ROMs as you can fit in your /sdcard. All the ROMs are stored in /sdcard/multirom/roms or on an USB drive. This folder is unaccessible in Android, to prevent mediascanner from scanning it. You can either in recovery, or obtain root and go to /data/media/0/multirom/roms.
Can I have different versions of Android working alongside
Yes. As long as you select "Don't shere kernel" when installing the secondary ROM, the systems are separated.
MultiROM recovery says it's 2.6.3.0. Why isn't it updated to 2.6.3.*highernumber*?
It is, it just shows wrong version.
The menu with all the ROMs won't show up during boot, how to fix it?
Either re-flash the MultiROM zip or go to recovery, Advanced -> MultiROM -> Inject curr. boot sector.
The reason for this is that something rewrote your boot.img, which happens for example when you flash a kernel. MultiROM's boot menu is part of the boot image, so it has to be added into it again.
Will you port MultiROM to device X?
No, probably. I won't port MultiROM to any device I don't own, because it is very difficult to provide the level of support I want to provide if I can't test things myself, as proven by the Nexus 4 port. I'd like to support more devices, but it is also very unsatisfying to work on code for device I don't have - I invest hours upon hours of time for free into it, and then I can't even see it running on the device, so...why..bother..?
I'll probably keep buying Nexus devices and keep porting MultiROM to those myself, but I can't buy every single device - I'm still a student, all my existing devices were bought using some kind of money grant or donations from users.
But, you can port it yourself, the wiki should give you at least some idea how to do that: https://github.com/Tasssadar/multirom/wiki/Porting-MultiROM
44MultiROM v25 adds support for the Android L preview. I've also made flashable ZIP images which you can use to flash the preview as secondary ROM to MultiROM. These are also slightly modified to fix SuperSU - you still have to flash it separately (the zip is not pre-rooted), but it will work. You also need SuperSU 2.00. Also, the first boot takes ages because ART.
The Android L preview is not as smooth as current stable 4.4.4. I'm not sure if it is because it is preview or because MultiROM is messing up something - can somebody who installed it without MultiROM confirm or deny that? Thanks.
The MultiROM Manager android app doesn't work on the L preview because of the SELinux changes - I know about it and will fix it...soon.
MultiROM v25: http://tasemnice.eu/multirom/multirom-20140627-v25-flo.zip
Flashable ZIP with Android L (LPV79): https://mega.co.nz/#!Rw0DlCBQ!yP3NbdoQ0uEpGWUjIxOaRZM0U8MJ4E7xMPuH6_eSpeg
GoddammitbothdevhostandgooimarenotworkingsoIhavetousemega.29MultiROM v22b was released and it fixes excessive battery drain. There is a brief period when screen is completely turned off between MultiROM GUI and ROM's boot animation. The screen drawing code was replaced, if it causes problems on your kernel, you can force using the old one (which causes the battery draining) in recovery -> Advanced -> MultiROM -> Settings, Force using generic screen drawing code.
Now, a more detailed info about what happened: there is a hack in flo's video drivers which turns on display backlight when the device is in recovery. It is triggered by manipulating the framebuffer device, which, on normal device, is done only by recovery, Android uses different methods to draw on screen (which require proprietary libraries). This hack turns something on, and it drains the device's battery, even while in deep sleep. Normaly, you wouldn't encounter that because you're not staying in recovery for long enough.
The problem is that MultiROM uses the same screen drawing method as recovery, but there is no device reset between MultiROM's GUI and Android. That means it triggers the hack and the increased battery consumption in Android is the result. It wasn't happening on secondary ROMs because with kexec-hardboot, there is a device restart after you choose the secondary ROM (to load another kernel) and everything gets reset into its initial state.
The workaround which fixes it is to use different method to draw onto screen - it is called "Qualcomm overlay" and thankfuly, it doesn't trigger that hack in kernel. Other than that, it is comparable to the old method, if somewhat faster. We are very, very lucky this method exist and that I know about it - big thanks to Dees_Troy of TWRP for that. If it did not, the only way to fix it would be find what exactly causes the drain, fix the kernel drivers and then get the fix into all kernels.
Some of you are reporting that this wasn't an issue for you - can't tell you why. Maybe there are kernels where this is fixed, maybe you just didn't notice it. For me, it was happening on every bootloader version, every kernel and every ROM I tried.
It was present in MultiROM since release, over half a year now. I'm somewhat surprised nobody reported it for so long, but I don't blame you - I thought it was the ROM myself, I even switched my main ROM for some other, because MultiROM doesn't do anything which should affect something like power consumption. That hack in kernel is just evil, and you have no idea how long it took me to figure out what the hell was happening.
Anyway, it is "fixed" now. Something like this shouldn't even happen, but it did. Sorry for that.
Oh, and the recovery was updated to TWRP 2.7.
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