[Transformer TF300T Android Development] f69m:
Installing ROMs

Custom 4.2- and 4.4-based ROMs

To install/update your primary ROM, just flash it as usual with the modified MultiROM TWRP, using "Install" from the main screen.

Installing a secondary ROM is just as easy, but use:

Advanced > MultiROM > Add ROM

You can update a secondary ROM by flashing it from the ROM management screen, using;

Advanced > MultiROM > List ROMs > [select your ROM] > Flash ZIP

OTA updates using the update manager coming with your ROM should work fine for both primary and secondary ROMs.

Note: It is no longer necessary to remove the assertion from a 4.2 updater-script.

Gaps, SuperSU, etc.

You can flash additional ZIP files for a secondary ROM from the ROM management screen, using:

Advanced > MultiROM > List ROMs > [select your ROM] > Flash ZIP

Asus Stock ROM

Asus stock ROM has a different installer and won't work the same way as custom ROMs.

Here are the steps to install stock ROM as your primary ROM:

Sorry, I have not tested this myself yet, please let me know, how it works out.

Unzip the Asus ROM twice to get the blob.

Flash the blob using fastboot.

Boot into stock ROM.

Re-install the modified TWRP using fastboot (use the separate download).

In TWRP: Advanced > MultiROM > Reinstall.

This should give you a working MultiROM setup with stock ROM as your primary ROM.

If you need more detailed instructions on the first two steps, please refer to the guides in the General section.

Ubuntu Touch

Coming soon...

Ubuntu

Not working yet.

Notes on Specific ROMs

CROMi-X 5.3

Don't try to install CROMi-X as a secondary ROM. It has an amazing installer, but that will nuke your primary ROM's /system partition.

Trouble-shooting

If your primary or one of your secondary ROMs is not booting properly, it can help to restore the boot partition of the primary ROM and then do a clean reinstall of MultiROM.

No worries, you can move your installed secondary ROMs to the side and move them back later.

First try restoring the boot partition from your latest backup, before installing MultiROM and reboot.

If your device boots cleanly into your primary ROM, without showing the MultiROM boot screen, you can skip ahad to step 3.

Next try flashing an unmodified recovery, re-flash your primary ROM and reboot.

If your device boots cleanly into your primary ROM without showing the MultiROM boot screen, you are ready to go to step 3.

Otherwise you should post your issue.

Use a root terminal or a root exlorer to remove the folder /data/media/0/multirom.

Alternatively you can rename that folder, keeping your installed ROMs.

Note: though this folder is on the sdcard, you have to use the path given; trying to use /sdcard or /storage you will get "permission denied", when trying to remove or rename the folder.

Reflash the latest multirom-v*.zip and reboot.

Make sure you see the blue progressbar on the first boot screen and you see another automatic reboot.

Then the MultiROM boot screen should show up.

Try booting your primary ROM. It should now start cleanly.

Try installing a secondary ROM, or move it back to /data/media/0/multirom/roms/ from the folder you renamed above.

Just moving back the folder will make it show up on the MultiROM boot screen.

Please read and follow each step carefully.

If these steps do not make all your ROMs boot properly, please post about your issue in this thread.