DUAL BOOT PATCHER
DualBootPatcher is an open-source app that allows multiple ROMs to be installed on a single Android device. It does its best to work with existing code and does not require explicit support from ROMs. This will allow any number of ROMs to be installed at the same time. It works by patching the secondary ROM's installation scripts and boot image to load the ROM files from an alternate location (/system/multiboot, /cache/multiboot, and /data/multiboot). Because of the way this is implemented, no changes to the primary ROM are necessary
How to use the patcher
Download the patcher apk and run it. Tap "Patch Zip File" from the navigation drawer and choose the file you want to patch.
Double click DualBootPatcher.exe and choose the file you want to patch.
After patching the zip file, a new file, like some_rom_data-slot.zip file will be created. For example,
After patching would create a new
Instructions for dual booting
Before doing anything, download the Dual Boot Patcher.apk from the download section below.
The patcher offers several locations for installing ROMs:
- Primary: This is normally used for installing a zip to the primary ROM. It is not required, but is strongly recommended because it has code to prevent the zip from inadvertently affecting other ROMs.
- Secondary: Secondary is the first multiboot installation location. It installs to the system partition. This is a good spot for installing a second ROM because it doesn't take any space away from the internal storage.
- Multi-slots: There are 3 multislots: multi-slot-1, multi-slot-2, multi-slot-3. These install to the cache partition. This is specifically for devices, like the Galaxy S4, that have a massive cache partition.
- Data-slots: There can be an unlimited number of data slots. These install to the data partition and eat up space on the internal storage. This is useful for devices where the system partition is nearly full and the cache partition is tiny. These slots are named "data-slot-[id]", where "id" is something you provide in the app.
- Extsd-slots: There can be an unlimited number of extsd slots. These install to the external SD card, which is useful as it keeps the ROMs off of the internal storage. Note that the ROM's data files are still stored on the data partition.
With that said, let's get to the "how to"!
- First, boot into your primary ROM and install the Dual Boot Patcher app
- Open the app and go to "Roms" in the navigation drawer. It will ask if you want to set the kernel. Make sure that you do.
- Go to "Patch zip file" in the navigation drawer and patch the ROM or zip you want to install. You can select one of the installation locations described above.
There are two ways of flashing the patched zip file. You can either flash it normally from recovery or flash it using the in-app flashing feature. Both methods are explained below.
Flashing from recovery
To flash from recovery, just flash the patched zip file like you would for any other zip. Nice and simple.
To use in-app flashing, go to "Roms" in the navigation drawer, tap the floating button on the bottom right, and add the zips you want to install. You can queue multiple zips and they will all be flashed in one go. Once you've added all the zips you want to flash, click the check mark in the action bar and they will be flashed right away.
A normal backup from recovery will backup every ROM. If you would like to back up ROMs individually you can do it using the app.
How do I...?
Switch the ROM if something doesn't work properly?
You can flash the DualBootUtilities zip from recovery. It will provide a menu interface that allows switching to the various ROMs.Wipe /cache, /data, /system, or dalvik-cache?
If you have TWRP, you can also switch manually by tapping Install -> Images (bottom right) -> Go to /sdcard/MultiBoot/[Your ROM]/ -> flash boot.img.
The easiest way is to do it from the app while booted in another ROM. Just go to "Roms" in the navigation drawer, tap the 3 dots options menu for the ROM you want to wipe, and tap "Wipe ROM".Update the primary ROM?
NOTE: Don't use the recovery's built-in wiping abilities as that may delete non-primary ROMs!
Patch the zip for primary and flash it. The "primary" installation target is designed so that other ROMs won't be affected when you want to flash something for the primary ROM.Update a non-primary ROM?
Patch and flash the zip exactly like how you did it the first time.Flash a mod or custom kernel for the primary ROM?
Patch it for primary before flashing. If the zip does not wipe /cache, it is also safe to flash it directly.Flash a mod or custom kernel for a non-primary ROM?
Just patch and flash it
- You must always select 'Data-slots' as installation location for secondary roms on Redmi Note 4x. You can also use 'Extsd-slots' if you want to install on external storage.
- If your using MIUI (Multirom, Xiaomi.eu, etc), you may need to enable documents app by going to Settings> Installed Apps before trying to patch any file in DBP.
- Don't use official MIUI as primary rom.
- If you're not able to boot to secondary rom, it might be that your data partition is encrypted, to fix this follow the instructions below:
First backup all your data including Internal Storage, then boot to TWRP>WIPE>FOMATE DATA then type 'yes' and tap enter. Now reboot and retry DBP.
App sharing not working.