Our beloved developers from TWRP team have issued a serious warning for Nexus 6P operators using TWRP 3.0.2-1. Due to a fatal bug in the stated build, backing up and restoring an EFS partition will brick your Nexus 6P and prevent it from booting.

 

Do not backup and restore EFS partition using TWRP 3.0.2-1 on your 6P!

 

The warning comes from the TWRP IRC channel and has been brought to our knowledge by XDA member bogomil4e. We thank him for his prompt action on informing everyone at the XDA-Developers forum.

View the announcement at original XDA thread

TWRP has already worked out on the issue and pushed a new build to the servers. You can either use a previous version of TWRP like 3.0.2-0, or the fixed 3.0.2-2 build.

If under any unfortunate conditions you have bricked your 6P and need to fix, you can follow the set of instructions below. Note that you will require ADB (Android Debug Bridge) to execute the commands. So install Android SDK on your PC.

  1. Boot your 6P into TWRP recovery.
  2. Connect it to the PC using USB cable.
  3. Open a command-prompt/CMD window.
  4. Enter the commands:
    ADB shell dd if=/dev/zero of=/dev/block/platform/soc.0/f9824900.sdhci/by-name/modemst1 bs=16384
    
    ADB Shell dd if=/dev/zero of=/dev/block/platform/soc.0/f9824900.sdhci/by-name/modemst2 bs=16384
  5. Finally, go to the TWRP main screen and tap on Reboot > System.

This should help you revive your 6P from the brick. Again, we thank ‘bogomil4e‘ for all the information.

We are not sure if any other Android devices are affected from the bug. If your device (other than 6P) has a similar issue with the 3.0.2-1 build of TWRP recovery, let us know immediately through the comments below. This will help several other users.

This is probably the first time with Nexus 6P, that TWRP has caused a brick. We appreciate the team for there immense hard work and letting us know about this issue before we took our devices back to RMA. Drop your opinion below.

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Dhananjay (DJ) is an Android devotee and a Tech Blogger by profession. He is a keen undergraduate, seeking and working hard on his ambitions to achieve something distinctive in his life. He prefers interacting with his readers in the most reproaching manner possible and his desires here are not just to reach out the tech figures, but also attract those those non-interested minds to our Android universe. He proudly owns Nexus 6P, Nexus 5, OnePlus One and a Nexus 4.
  • Ronnie McCarthy

    thank you so much, if it weren’t for finding this i was gonna go out tomorrow and buy a new phone altogether, so you’ve saved a good few hundred pounds :’)

    • You are welcome Ronnie. We appreciate TWRP for letting the word out, and bogomil4e for informing us on XDA.