[Guide] Install double boot CM7 + CM9

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Here's a simple guide for CM7 users, to install CM9 as a test rom AND keep their CM7 ROM as a main ROM

EDIT (01/04/2012):Guide updated according to new versions of multiboot. Also works for CM10!

DUE TO KERNEL INCOMPATIBILITIES, MY GUIDE IS FOR PEOPLE WHO INSTALL CM9 +CM7 WITH THE SAME KERNEL. (EX: CM7 FROYO KERN + QUARX CM9 FOR FROYO KERN)

This guide is tested and approved on froyo kernels.


First: I suggest you backup your rom before doing anything, but there's no danger don't worry

first download and simply place on your SD-Card these files:

m11kkaa's multiboot:
http://forum.xda-developers.com/show....php?t=1364659

This will allow us to lauch our main ROM normaly, and when we want to, launch our 2nd rom (which will be CM9 =D)

Epsylon3's or Quark's latest version of CM9:
http://defy.wdscript.fr/
Or
http://quarx2k.ru/

Google Apps (optional):
http://goo-inside.me/gapps

Place all 2/3 zips on SD-card.

Download 3filesystem images that will be your virtual partitions for CM9 on Sdcard:
www.mediafire.com/?vvkmy2tx4yeg32m
extract them, and place all 3 of them under /multiboot/CM9 in SDcard
You can also use the app called multibootmanager to do this

Warning: these partitions have size limits (300mb each). Don't run out of space!
People who know how to can create their own partitions, any size they want, threads exist for that


Here are the instructions:

[SIZE="3"]
DO NEVER WIPE DATA DURING PROCESS, IT IS NOT NEEDED

1) Go into Bootmenu
2) Choose "recovery ->" to go to the recovery choice menu
3) MAKE SURE you have:

• "Custom Recovery" OR "Latest Recovery"
• "Stable Recovery"
• "Stock Recovery"

4) Choose "Stable Recovery"
6) Install Zip from SD-Card: multiboot_vXXXX.zip
7) REBOOT SYSTEM NOW
8) When you get the blue led, press Vol. Down, you will be in the Bootmenu.
-Choose boot->Set Default->2nd-init
-Go back once
-choose [2nd-system] to boot into the 2nd system menu.
- Here is where you will be able to select 2nd roms to boot. If you put the files on the SDcard in the right place (see above), you should see them in the menu. Other choices are "boot from nand","recovery" or "reboot".
- Choose Recovery(CWM), and then select which rom you want to apply the modifications (CM9). You will now reboot into a recovery for your virtual system.


[SIZE="3"]9) a) Install zip from sdcard: CM9!!! =D
9)b) (OPTIONNAL): install google apps
10) Wipe cache and dalvik cache and then reboot system.
11) Done! reboot. If you want to launch CM9 just press Vol. Down on blue led, boot into 2nd system like above and select CM8 to boot it.

Booting any virtual ROM will take a few minutes, sd cards are slower, and this will be first boot.

Enjoy Epsilon's, Quark's, m11kkaa's and walter79's great work!

Originally Posted by m11kkaa
Some info:
- After installation, The recoveries under the 2nd system multiboot menu is for your virtual system and "Stable Recovery" for your real system
- you can restore any backup or install any zip in "Lastest Recovery" and it will go into your virtual system
- boot the virtual system with the 2ndsystem-option in bootmenu

Tutorial video made by Yamandude:
http://youtu.be/aqdQSusw2zw

If one day you don't want CM9 again, simply remove the folder /fsimages/ from your SDcard.
I suggest you keep them in case, you may change your mind one day

You now have double boot, and CM7, and CM9 on your same phone!!!!

Troubleshooting:

• My main ROM works, but i get a bootloop with CM9

In latest recovery: wipe cache + Dalvik cache. If you still get a bootloop then wipe data too.

that sounds incredble,but i like it,just wait cm9 for stable.

Originally Posted by vehi_soc

that sounds incredble,but i like it,just wait cm9 for stable.

i´m with you. I´m looking forward for CM9 with green lens working with photo and video flash. Preferably stable.

Are u shore u flash multiboot from custo/latest recov?
I always do it from stable recov!



Sent from my MB525 using xda premium

It IS from custom and NOT latest recovery (step 4). Your "guide" is incorrect and if you ask me, makes things even more complicated than they are...sorry.

In what way is this needed amyway?; there's already a multi-boot thread.

No warning about NOT wiping data in latest recovery...Nothing about the size and limits of the 3 image files...

Originally Posted by [] AL []

It IS from custom and NOT latest recovery (step 4). Your "guide" is incorrect and if you ask me, makes things even more complicated than they are...sorry.

In what way is this needed amyway?; there's already a multi-boot thread.

No warning about NOT wiping data in latest recovery...Nothing about the size and limits of the 3 image files...

"Custom recovery" as we know today used to be called "latest recovery" a few months ago. The name changed so i mentionned both names in case people get confused if i say only one and they see the other. What is important is checking if you have three recoveries, not the way you call them.

Seen as CM9 is for test purposes, i doubt that warning not to install to much apps on the Second ROM is very relevant. Even though i will take into account your comment

Sent from my 1Ghz CM7 Defy

Originally Posted by nogoodusername

Are u shore u flash multiboot from custo/latest recov?
I always do it from stable recov!

If you flash multiboot.zip in the stable mod, you'll change mount settings for your 2nd init partition, and then it will be your main rom that will load from sdcard. I tried this and unfortunately my main com became CM9, and it is not what we want ^^.

Sent from my MB525 using xda premium



Sent from my 1Ghz CM7 Defy

In fact, my bad: I meant "stable" not custom. m11kkaa multiboot is to be installed in stable recovery and never in latest.

Never wipe data in latest recovery or android secure will be erased and your main boot apps will stop working.

There are incompatibilities between some roms: MSGinger will not work with ics..

...OP need some work to say the least...

Here:

Originally Posted by [] AL []

QUOTE=twa_priv;19863273]I think that's exactly what most people here are doing. Look at AL's post (http://forum.xda-developers.com/show...&postcount=280) which is the one that got me started using multiboot.

Yes thanks. He might also be interested in reading this one and this one as well on this.

Edit:

And i don't know about wajkiui, but there's is a problem with MSGinger though; so be warned!

Just give it a shot anyway... but if there was ever a reason to make a nandroid backup of your current build before jumping into something, I think multiboot calls for it...

L.E.: and while I think about it: one drawback I've noticed from multiboot is that once you boot back into your main rom, the battery stats are screwed up (or to the state they were when you left for the 2nd-boot). So give your phone a nice long charge to fix this or don't complain about eventual steep battery drop...[/QUOTE]

Originally Posted by crakeron

If you flash multiboot.zip in the stable mod, you'll change mount settings for your 2nd init partition, and then it will be your main rom that will load from sdcard. I tried this and unfortunately my main com became CM9, and it is not what we want ^^.

Sent from my MB525 using xda premium



Sent from my 1Ghz CM7 Defy

That is incorrect...that's how I did (and others and how m11kkaa's instructions were at first _ I believe) and CM7 IS my main boot and ics my 2nd boot. And multiboot zip most probably can be install with both when you think about it. It's ICS that you absolutely need to install in latest/custom recovery... that was my last comment here good luck with this thread.