I rooted my device (lenovo 2107a) and then updated new custom firmware with below instructions:

  • Downloaded new firmware into sdcard/clockworkmod
  • booted to CWM
  • selected "backup and restore" -> "advanced restore from internal sdcard"
  • and chose my custom ROM
  • Then i selected "system restore"

So i saw an error that said cannot restore and restore goes to break. now when boot my device i see a screen that wants to select country code and after select device will reboot again and i see same screen.

so i decided to restore my old backup, but even old backup restoring gives me the error that cannot restore.

i find the problem, when i open shell with this command:

adb.exe shell
segmentation fault

the problem is that all of data in /system is read-only and i cannot even root with su. i tried everything like re-rooting device, but still i cannot shell as root.

mount cannot be run (operation not permitted)

adb.exe remount (cannot be execute)

fixsu.sh cannot be executed because has not access to /system (everything is read-only)

psneuter gives (failed to set prot mask (inappropriate ioctl for device))

is there any way to delete /system and re-upload that or something that can solve my problem?

  • If I understand correctly... You tried to install a custom ROM, but instead of choosing "Install from zip...", you choose "Advanced restore..."...? Aug 2, 2013 at 18:36
  • yes i did, your right Aug 2, 2013 at 18:47
  • did you tried adb root then adb shell?
    – St0rm
    Aug 21, 2020 at 15:19

1 Answer 1


I got a tip from XDA dev's under Android-General Developing: give the custom ROM a new name by renaming "update.zip" on the SD Card. Under CWM, pick this "update.zip" under Update setting.

This was tested with Moto Defy+ 2.3.6 stock ROM and HTC One V GSM with a Sense 5.0 custom ROM when I tried to install MIUI 5.

  • 1
    Perhaps a link to that particular thread would be nice
    – Sid
    Sep 15, 2013 at 7:19

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