I have a Google Nexus 7 (2012) which for no apparent reason entered an endless reboot loop. Trying to fix it with a fresh install of the OS via TWRP, I unintentionally messed up the partition table.
Now the device doesn't even show the Google startup screen. The screen stays bare dead whatever I try (power + volume down, up, upsidedown, usb plugged in, immersed in Coke, boiled...).
Is there a relatively inexpensive way to interact with an android device that has its partition table damaged?
(Of course, it is not detected by
Probably they don't add much to the description of the problem, but for the sake of completeness, here are the latest steps of this tragedy.
Connected as root via
adb I used
parted to try and enlarge the size of the system partition (because the OS image didn't fit the system partition). It returned an error saying that it did not recognize the disk label.
/system/bin/sdparted # ./parted /dev/block/platform/sdhci-tegra.3/mmcblk0 GNU Parted 18.104.22.168.179-aef3 Using /dev/block/mmcblk0 Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) p p Error: /dev/block/mmcblk0: unrecognised disk label (parted) quit quit
So I reverted to fdisk, not really knowing what I was doing. It asked if I wanted to write a new label and it seemed a good idea to me to do so and I persisted the change. (In retrospective I see it wrote a DOS partition, which doesn't sound as good)
/system/bin/sdparted # fdisk -u /dev/block/mmcblk0 Device contains neither a valid DOS partition table, nor Sun, SGI, OSF or GPT disklabel Building a new DOS disklabel. Changes will remain in memory only, until you decide to write them. After that the previous content won't be recoverable. The number of cylinders for this disk is set to 481024. There is nothing wrong with that, but this is larger than 1024, and could in certain setups cause problems with: 1) software that runs at boot time (e.g., old versions of LILO) 2) booting and partitioning software from other OSs (e.g., DOS FDISK, OS/2 FDISK) Command (m for help): write The partition table has been altered. Calling ioctl() to re-read partition table fdisk: WARNING: rereading partition table failed, kernel still uses old table: Device or resource busy
Then I switched back to
parted, which had an apparently nicer output:
/system/bin/sdparted # ./parted /dev/block/platform/sdhci-tegra.3/mmcblk0 GNU Parted 22.214.171.124.179-aef3 Using /dev/block/mmcblk0 Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) p p Model: MMC HAG2e (sd/mmc) Disk /dev/block/mmcblk0: 15.8GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags (parted) quit quit /system/bin/sdparted # exit
I rebooted and from that moment on the tablet shows no signs of life.