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Or, 'My tablet's hardware "Volume Up" button is broken, now what?'

I'm trying to root an Asus TF300TG Transformer tablet (a 2012 model, unlocked), following this guide: http://forum.xda-developers.com/showthread.php?t=2617298

  • I have installed the USB drivers on my computer
  • Rebooted tablet to fastboot
  • Flashed the TWRP recovery without problems
  • (Rebooted normally, verified that tablet still works as usual)
  • Rebooted to fastboot again
  • Got to the point where I should boot to the new recovery

That step requires me to press the Volume Up button to select the recovery option (at this screen: http://i.imgur.com/Fbogr.jpg ). In my tablet, however, the button is broken (and has been for some years now). Is there a way to get into recovery without actually pushing it?

What I've tried:

  • pushing harder
  • pushing the other two HW buttons: Volume Down moves the selection, Power does nothing
  • connecting the keyboard dock: there is a Volume Up button, but it doesn't do anything in fastboot mode; none of the dock buttons do anything
  • connecting a USB keyboard via the dock: no keypresses seem to do anything in fastboot
  • rebooting to recovery using fastboot reboot recovery: invalid command
  • booting an image using fastboot boot twrp.blob (and various other recovery images from my computer): loaded to tablet, then failed (downloading 'boot.img'... OKAY [ 0.398s] booting... FAILED (remote: ) - note the empty error message)

Is there a different way to get to recovery?

1

Yes, there is a way.

  • boot the tablet normally
  • enable USB debugging
  • connect to computer by cable
  • from the computer, run adb reboot recovery
  • tablet reboots directly to recovery
  • Done!

I was trying to issue this command in Fastboot (where it's not supported) instead of ADB (where it works).

  • (I have spent most of a day looking for this; better put it here, so it doesn't go to waste) – Piskvor Nov 9 '15 at 8:06

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