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Thread: TF300T bootloop after ROM flash, only TWRP accessible

  1. #1
    Soundwave
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    Exclamation TF300T bootloop after ROM flash, only TWRP accessible

    My TF300T was running a CM11 nightly for months until I got a notification that CM12 was available.
    I downloaded the CM12 snapshot and flashed WITHOUT WIPING ANYTHING (but I did make a nandroid backup) because I was lazy and thought "it's just a CM update, no need to wipe". Well, I was wrong! The device got stuck in a bootloop (even though TWRP said the flash was "successful")! I figured that my recovery (TWRP 2.8.1.0) was too old to support flashing a CM12 rom. I tried restoring the nandroid backup (system+boot+data) but that failed and so did restoring just the [boot+system] or just the [boot]. I thought it would surely be fixed if I flashed CM11 again since my recovery was obviously adequate for that. So I wiped everything (except for the media) and flashed the latest CM11 snapshot. TWRP said the flash was "successful" but the device is still stuck in a bootloop! The ASUS logo appears (just like normal) then after a while the screen goes black for a second and then the ASUS logo reappears and that goes on for HOURS. Restoring the nandroid still doesn't work. I can get to fastboot (and subsequently the recovery) by pressing [power+volume down].
    I thought that the problem was that my recovery was old and therefore flashing CM11 would fix everything (something similar happened to my phone years ago and that was how I fixed it) but it seems I was mistaken! That means I now have NO IDEA what's wrong!

    To recap:
    --TWRP 2.8.1.0
    --was running CM11
    --made a nandroid backup
    --flashed CM12 without wiping => successful
    --BOOTLOOP
    --nandroid restore FAILED
    --flashed CM11 again => successful
    --BOOTLOOP
    --nandroid restore FAILED

    PS: I've had my Transformer for years and I really like it. It's so useful and convenient, I use it for so many things and it was very expensive too! I really need to fix it... I've been rooting devices and flashing ROMs for 4+ years now and I've always known what to do to fix them after researching the problem on Google. But this time I really don't know what to do... Any help would be greatly appreciated (you can't imagine how much).

  2. #2
    Chief Customizer & Super Moderator
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    Assuming that you are on the latest bootloader I would recommend that you do a full format of /data and then reflash CM11.
    CM11 is KK, CM12 is Lollipop - lots of changes between the two...
    I am not that familiar with CM roms so I can't tell you what the requirements for CM12 are but I would always do a full format going from a KK rom to LP.
    Use TWRP's file manager to move everything not backed up to a microSD because the formatting will erase everything on internal.
    After the format - and it can take 90 minutes - reflash CM11 or restore your nandroid and then do your research on what's required to move to a LP rom.

  3. #3

  4. #4
    Soundwave
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    I'm sorry for not replying for a month... I was busy with life in general and I just left my Transformer hooked to the charger (cause I can't even turn it off) and it's been like this all this time.

    Anyway, I wiped all the data as you suggested, rebooted to TWRP and flashed the latest CM11 from my external SD. An animated loading bar appeared but remained empty for a while. Then it said the flash was successful I wiped Dalvik/Cache and rebooted the system. A blue loading bar quickly filled up and the device booted into CM11!

    Oh my, thank you so much! For some reason I didn't think that a complete data wipe would make any difference because I thought that the media directory had nothing to do with the OS!
    Thank you thank you thank you thank you! You saved me kind stranger!
    droidbound likes this.

 

 

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