1. chingondomino's Avatar
    Apologizes in advance if I sound like a noob. I have searched and searched and am at my wits' end. Wondering if anyone can help me with a particular Nexus 7 problem I have. I can't update the bootloader of my pre-production Nexus 7 (Nakasi Wi-Fi) from version 3.24 to 4.23.

    When I initially unboxed and turned on the Nexus 7 I had just been given I found out that it's a developer model running Jellybean with bootloader version 3.24.

    At first tried all of the usual ways of updating the OS. Unfortunately none of the ways I tried, via Android Studio, Minimal ADB and Fastboot, and the Nexus Root Toolkit, worked.

    Here is the error report that I received from Nexus Root Toolkit when I attempted a straight update to 5.1.1:

    checking product...
    OKAY [ 0.001s]
    checking version-bootloader...

    Device version-bootloader is '3.24'.
    Update requires '4.23'.

    I read that if I edited android-info.txt file to read "require board=grouper require version-bootloader=3.24", I would be able to flash 4.1.2. It worked, and after a few hours of constantly updating OTA I ended up with a *slow* Nexus 7 running 5.1.1.

    I decided to start over and try to update the bootloader again. I know that in some builds there were some problems with bootloader version 4.23 but what I pulled was the latest off of Android's website (developers . google . com / android / nexus / images). That didn't work. I tried to flash it through a terminal. I tried to flash it through the Nexus Root Toolkit. I tried different USB ports 2.0 and 3.0 (which shouldn't matter since I was able to update just the OS initially) and that didn't work.

    The log in the terminal says:

    FAILED (remote: (InvalidState))

    The *extremely* small text on the Nexus screen says:

    signature mismatch
    failed to process command flash bootloader error (ox8)

    I think that if I just update the bootloader version from 3.24 to 4.23 I'll be find. I'll be able to update straight to 5.1.1 and have a cleaner install. Unfortunately I can't find any way of doing so online. Any and all help is appreciated.

    06-07-2015 04:37 AM
  2. systemofadown1's Avatar
    Off the top of my head, did you give "force flash" a try in the root tool kit? If it takes try a factory data reset afterwards.
    The 4.23 boot loader is problematic & can drive one nuts
    06-07-2015 11:22 AM

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