HP 10 2101 Won't Boot, Trying to Flash System Image - Android Q&A, Help & Troubleshooting

My dad recently bought an HP 10 tablet from my uncle and asked me to root it...which was a mistake. I had a successful root with the Android-based version of King Root, cleaned it up with SuperSU Me, and thought everything was fine until I rebooted...and the tablet got stuck on the boot animation. Booting with the volume down button down resulted in just the HP logo, without the boot animation. Booting with the volume up button down booted into recovery. When I boot into recovery I'm greeted by this lovely message at the bottom:
Code:
E:failed to mount /cache (Invalid argument)
E:Can't mount /cache/recovery/log
E:Can't open /cache/recovery/log
E:failed to mount /cache (Invalid argument)
E:Can't mount /cache/recovery/last_log
E:Can't open /cache/recovery/last_log
E:failed to mount /cache (Invalid argument)
E:Can't mount /cache/recovery/last_install
E:Can't open /cache/recovery/last_install
E:failed to mount /cache (Invalid argument)
I have tried the following things from the recovery menu:
wipe data/factory reset:
Code:
-- Wiping data...
Wiping /data...
Formatting /data...
E:failed to mount /cache (Invalid argument)
Formatting /cache...
Data wipe complete.
wipe cache partition
Code:
-- Wiping cache..
E:failed to mount /cache (Invalid argument)
Formatting /cache...
Cache wipe complete.
apply update from internal storage
Code:
E:failed to mount /data (Invalid argument)
E:error opening /data/media/0: No such file or directory
Install from internal storage complete.
apply update from external storage
Code:
E:failed to mount /cache (Invalid argument)
E:failed to mount /extsd (Invalid argument)
(Tablet was booted with microSDXC card inside)
apply update from cache
Code:
E:failed to mount /cache (Invalid argument)
apply update from ADB
adb was...weird. I verified the connection through adb devices, but most commands, including adb reboot bootloader, resulted in error: closed.
Windows side:
Code:
C:\Users\jkmar>adb devices
List of devices attached
* daemon not running. starting it now on port 5037 *
* daemon started successfully *
CNU4389ZNS sideload
C:\Users\jkmar\Desktop>adb reboot recovery
error: closed
C:\Users\jkmar\Desktop>adb sideload UPDATE.ZIP
loading: 'UPDATE.ZIP'
sending: 'UPDATE.ZIP' 100%
Tablet side:
Code:
Now send the package you want to apply to the device with "adb sideload <filename>"
...
E:failed to mount /cache (Invalid argument)
E:failed to set up expected mounts for install; aborting
Installation aborted.
E:Can't mount /cache/recovery/log
E:Can't open /cache/recovery/log
E:failed to mount /cache (Invalid argument)
E:Can't mount /cache/recovery/last_log
E:Can't open /cache/recovery/last_log
E:failed to mount /cache (Invalid argument)
E:Can't mount /cache/recovery/last_install
E:Can't open /cache/recovery/last_install
E:failed to mount /cache (Invalid argument)
E:Can't mount /cache/recovery/log
E:Can't open /cache/recovery/log
E:failed to mount /cache (Invalid argument)
E:Can't mount /cache/recovery/last_log
E:Can't open /cache/recovery/last_log
E:failed to mount /cache (Invalid argument)
E:Can't mount /cache/recovery/last_install
E:Can't open /cache/recovery/last_install
E:failed to mount /cache (Invalid argument)
UPDATE.ZIP came from HP's download page. I just don't know what to do at this point.

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Please help also having the same problem with my HP 8 G2 1411

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You can't reboot in adb sideload, you can't do many things in adb sideload since it is intended for recovering from a brick and that is the only feature I know (if you have a custom recovery and want to do a clean install, you wipe every partition and then sideload it, so the sideload feature is intended for flashing), you can't reboot, I fired up my test device to confirm this and it was true. If you extract the .zip file, does it contain any .img files and .gz files?

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Crap, somehow I missed this thread actually getting a reply. Thanks!
Yes, there is a boot.img file as well as a system folder containing what I'm used to seeing in the root directory.

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jkmartindale said:
Crap, somehow I missed this thread actually getting a reply. Thanks!
Yes, there is a boot.img file as well as a system folder containing what I'm used to seeing in the root directory.
Click to expand...
Click to collapse
Can you boot into the bootloader? It can be a weird combination by the way, my tablet is press and hold power button then one second later you'd have to press and hold volume down.

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I'm not entirely sure what the bootloader looks like, so I don't know if I have. As mentioned in OP, I did manage to boot into something that just showed the HP logo and nothing else. In that stage I tried both adb devices and fastboot devices, but nothing showed up. Rebooting into recovery and picking apply update from ADB was the only way I was able to get it to be recognized by adb devices so far.

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jkmartindale said:
I'm not entirely sure what the bootloader looks like, so I don't know if I have. As mentioned in OP, I did manage to boot into something that just showed the HP logo and nothing else. In that stage I tried both adb devices and fastboot devices, but nothing showed up. Rebooting into recovery and picking apply update from ADB was the only way I was able to get it to be recognized by adb devices so far.
Click to expand...
Click to collapse
Extract the boot.img and then adb sideload it. Report result and log.
For your information, the boot.img is the kernel so you will basically reflash the kernel.
If I helped, hit "thanks" .

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I got the same result for both update.zip files on the support website. boot.img was extracted using 7-zip both times.
Code:
C:\WINDOWS\System32>adb sideload boot.img
loading: 'boot.img'
* cannot read 'boot.img' *