[Droid Incredible Android Development] Team ADX:
The below info will remain for historical informations but this system has been replaced by a better system found at http://xdaforums.com/showthread.php?t=1100777

DualRom ***Dual boot 2 roms on your Droid Incredible***

Team ADX presents your dual booting solution for the Droid Incredible. Please Read entire post before using any of the zips given. Undo zip in second post to put your phone back to the state it was in before flashing these zips.

I have added some empty shells to allow people to use any rom. See bottom of first posts.

DualRom comes in DualRomSenseFroyo and DualRomCM7. We wanted to give you the option to basically use the opposite of what you would use as your normal rom. CM7 is CM7. It was compiled from CM7 source and only made changes needed for it to boot off interanl storage. SenseFroyo is stock rom with Ziggy's kernel to allow overclocking. I did not remove any bloat since you will have over 5GB's free so there is plenty of room. I don't use sense roms so I'm not familiar with what sense tweaks are out there but I may research and make changes to the sense rom in future updates. I chose these roms because I wanted roms that would be very stable right out of the box. This is a new method for dual booting and there hasn't been any wide testing yet so you should still consider this Beta till there is more feedback. Everything has been stable in the limited testing. All feedback encouraged and appreciated.

DualRom Terminology for this post

PhoneRom - refers to the rom that is installed normally on your phone

InternalRom - refers to the DualRom version that you install

* Who is Team ADX?

For those that don't know us Team ADX was formed by a few Dev's from the HTC Droid Eris. We collaborate on projects together even though we've all branched to different phones. Team ADX is Conap, Workshed, and Gnarlyc. Conap has the Droid Incredible and will handle most of the support in this thread. The Team ADX account is usually only used for the op and all follow posts will be done with our personall accounts.

* Why would you want 2 roms on your phone?

Sometimes you can't decide between Sense and CM/Aosp roms. Both have thier benifits and both have thier downfalls. Why not have both on your phone. For app developers this is a great solution so that you can easily test your apps on Sense and Aosp roms. Also it's just another cool reason to root right?

* Any downside to this?

The only downside for this is that it uses the entire 6.5Gb of internal storage that the incredible has. The reason it does is because the emmc which includes the 6.5GB of internal storage also includes the 750mb's for the data partition and the 200mb's for the cache partition of the phone. For this reason HTC has locked this from being repartitioned. I did not find a way to unlock it although there probably is. I personally don't use the internal storage on my phone at all since most apps defaut to sdcard. If you don't use or need to use your internal storage this is a great alternative to what you can use it for. I tested many methods which included putting the rom on SD card or rearanging the partitions where the normal rom is stored and I found this method to be most stable and the least intrusive to your normal rom.

* How does it work?

With this DualRom setup you will be able to keep your current rom and even change your current rom on your phone in the normal fashion you are used too. There is a zip file to flash before flashing your DualRom that will set up your current rom to work with DualRom. It only makes minor changes to your current rom and I will explain that during install instructions. The DualRom will then get installed to the internal storage of the phone. An app called DR Reboot written by Conap specifically for this setup will be installed in both roms that will let you boot back and forth between the 2 roms. There will also be zips automatically added to your sd card that will allow you to choose which rom you want to boot to from recovery.

* Is this risky?

With any phone modification done with root there is always risk involved. From my testing I determined the phone would not let me repartition the internal storage therefore not letting me screw up the phone. As long as you use the zips we provide there should be no issues. As always though flash at your own risk!!!!

* Is this compatible with my rom?

DualRom should work with any rom you use. For the DR Reboot app to work you will need a rom with busybox installed but that is pretty standard. If DR Reboot does not work for you you can use recovery to boot back and forth. The zip you flash in recovery only takes a few seconds so this is still a much faster option then doing nandroid/restore's.

* How do I install this? What do the zips do?

The zip files are named with a number to start. Flash in the order of the numbers. All my testing was done with CWM v2.5.1.2.

1DRPrep-setupEMMCforRomFlash.zip We flash this zip first. All it does is change the filesystem of the internal storage partition(6.5gb) from fat32 to ext3. THIS WILL ERASE ALL FILES FROM YOUR INTERNAL STORAGE. Please backup any files you want to keep. This zip can also be used to reformat if you decide you want to switch from one version of DualRom to another(i.e. Sense to CM7). This zip will take a few minutes to flash so be patient.(I know my progress bars don't move right in recovery but it is working).

2SetupPhoneRomForDualBoot.zip We flash this second. This zip will do a couple of things. It installs the app into your current rom that will allow you to boot back and forth. It also backups the boot.img from your current rom to your sdcard so that it can use it when you want to boot back to the Phone Rom. It add's another zip to sdcard that allows you to boot back to Phone Rom from recovery. It also adds an edited vold.fstab to your current rom so that your phone will not complain that it can no longer fine the interal storage since your using it for something else. If you have dualrom already installed and decide to flash another normal rom to your phone you can just re-run this zip after flashing the normal rom.

3DualRomSenseFroyo.zip or 3DualRomCM7.zip These are the actuall roms. They will install the rom to the internal partition and also put a zip on your sdcard that allows you to boot the internal storage rom from recovery if you need too. Please flash only one of these.

* I've installed it now what?

Once you have flashed the first 3 zips your phone is ready to reboot. Reboot the phone and it will boot to the internalrom. This is a first boot so it will take a few minutes but not really longer then the first boot on a normal rom. Once it boots go through the normal setup of the rom. Then you can look in the app drawer and you well see DR Reboot app. I would reccomend placing a shortcut to this on a home screen somewhere for ease of access. Open DR reboot and from there you can reboot to the phone rom, internal rom, or recovery.(See Photo at top of post) You can still use the normal reboot options of the rom if you want to boot back into the same rom you are in. Alternativley you can boot to recovery and flash the bootphonerom.zip or the boot-internal.zip's to boot to either rom. These are a backup mainly in case the DR Reboot app malfunctions (occasionally it fails to flash the boot.img)and you need to get back into one rom or the other. I would not delete them from the sdcard. That's it....use the roms as normal and boot back and forth as you wish.

* My phone won't reboot to the phonerom even after flashing the phonerom.zip in recovery?

This is why we do a nandroid backup. Restore it now and then reflash the 2SetupPhoneRomForDualBoot.zip.

* What about tweaks/zips/themes?

If the phone is booted into either rom then anything you apply will get applied to the rom you are booted in...(i.e. metamorph). Keep in mind I have not tested much as of yet with the internal rom but in theory it will work fine. The phone rom will continue to work as normal. Any flashable tweaks/themes will only affect the phone rom. The install scripts would need to be modified to apply them to the internal rom. It shouldn't be too hard to modify them and I will try to post some instructions on that later.

* What about ADB?

ADB will acess what ever rom you have booted at the time.

* Will this allow us to boot other operating systems(i.e. WM, IOS)?

No they are not bootable on android devices and don't know if they ever will be. This will allow us to boot larger Rom Ports as some of the Rom's are getting larger then our internal storage.

** KEY POINTS TO REMEMBER

1. Everytime you flash a normal rom please flash 2SetupPhoneRomForDualBoot.zip after to update your stored boot.img.

2. Try to stick with more stable tweaks on the internalrom untill we can work out a easy way to wipe data/cache or a way to make a reliable nand.

3. Nandroid is your friend. Don't forget to do your normal Nandroid's in recovery for the phonerom before flashing any zips.

4. Zips are numbered in order so you can flash them in order.

5. Enjoy your 2 roms!!!

** TODO List

1. Make data/cache wipes available

2. Watch to see if the roms sharing the .android_secure folder on sd is going to be a big problem. So far in my testing is has not been an issue.

3. Make some type of Nandroid available...We have a something but it's not very reliable so working on a more stable method.

*Thanks to:

Cyanogenmod for thier great work http://www.cyanogenmod.com/

Htc I guess for sense and for making quality phones.

Ziggy471 for his kernel http://www.ziggy471.com/

TeamADX members for all they do!!!

XDA member unCoRrUpTeD for getting me interested in Dual Booting

Everyone and anyone who contributes to open source projects

Downloads

FLASH AT YOUR OWN RISK

1DRPrep-setupEMMCforRomFlash.zip - THIS ZIP WILL ERASE EVERYTHING ON YOUR INTERNAL STORAGE WHEN FLASHED. YOU HAVE BEEN WARNED MD5-ea34104a4b8ee11ee3d6442c13c0f93c

2SetupPhoneRomForDualBootV2.zip MD5-f2a55ed14f720332cfe9f88d32918a9f

V2 fixes flash_image binary not having execute permissions causing phone to not boot from phone rom to internal rom. Make sure you are on phonerom and reboot to recovery and just flash this zip if you've already installed DualRom.

3DualRomSenseFroyoV2.zip

V2 includes update boot.img that i added in the test zip i posted. That's the only change.

DRSenseUpdatetoV2.zip

If you flashed v1 of sensefroyo you can just flash this to update so you don't need to wipe.

3DualRomCM7v3.zip

v3

Updated to CM7.02 Stable

v2

Adds new boot.img that automatically fixes the filesystem on reboot.

DRCM7v2Update.zip

Updates DRCM7 to v2 with no wipe if you already have DualRomCM7 installed.

How can I use other roms with this?

I made some rom "shells". You can open the zip of the rom you want to use and drag the system and data folders and drop them in the "shell" zip. There is a shell for miui 2.3, cm/aosp 2.3, and Sense 2.2. This way you all have the option to use any rom without me releasing other peoples work.

MIUI-GB-shell.zip

Sense-2.2-shell.zip

CM-AOSP-GB-shell.zip