I have a zenfone 5 which used to run on custom rom so i decided to revert it back to stock rom but when i wiped system cache and dalvik, it didn't go well and now i cannot start phone unless going into recovery. Twrp tells me those errors : unable to mount cache unable to mount system

Tried flashing custom rom again but it didn't work too. Any helps please :/

ps: my phone's usb is not working as a connector to pc i.e. pc cannot recognise the phone. please keep this in mind.

1 Answer 1


It appears like when you first wiped your partitions, the process was possibly interrupted and you now have corrupt partitions which are not being recognised in TWRP.

  • Please go to your TWRP settings and make sure that the use rm -rf instead of formatting option is not checked.
  • Now go WipeAdvanced Wipe section and try wiping all those partitions again which are currently giving unable to mount errors. Then reboot into TWRP and try again.
  • It is recommended that you use a charger during the wipe process so that a battery failure will not interrupt the process.

Tried flashing custom rom again but it didn't work too.

Please post the error that you get while flashing or at least a part of the error that appears, so that your problem can be understood properly.

  • This is another similar answer which might be of help. Follow the steps if you're sure that your partitions were formatted as EXT4 before. Commented Oct 10, 2019 at 14:08
  • Thanks for your answer but i tried going into recovery now in order to show you errors but the touch screen doesn't work now. I will try again and post screen photos showing errors later.
    – orhan7
    Commented Oct 10, 2019 at 14:18
  • 1) here is the error screen i get when i try wipe link 2) confirming the option rm -rf is unchecked 3) tried what you said and rebooted but nothing changed 4) will post flashing rom screen soon
    – orhan7
    Commented Oct 10, 2019 at 17:42
  • tried ext4 option that you've linked but it didn't help too
    – orhan7
    Commented Oct 10, 2019 at 17:45
  • Sorry about the late reply. I have also seen in some scenarios that this works - Change file system option → format the corrupted partition(s) to some other filesystem like exFAT or FAT32 → again reformat them to ext4. Also try using the Repair file system option to correct the corrupted file system. Commented Oct 23, 2019 at 13:54

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