Tutorial great thanks. All very clear and easy to follow. Unfortunately my issue must be a hardware failure. Originally stuck in a boot loop with the google logo. Did the usual soft/hard reset, deleted cache (Wasn't worried about losing data) but no joy. Followed the tutorial here to the letter with no un-expected faults. On final reboot still stuck with google logo. None the less, learnt a lot from here so thank you. Looks like a call to ASUS though :-(
After following the guide (which you did already according to your post).. Lock then unlock the bootloader again, in fastboot/bootloader mode using:
fastboot oem lock
Confirm it has locked
fastboot reboot-bootloader
Then
fastboot oem unlock
And confirm it on the device.. Then unplug it and let it reboot.... Might clear out whatever the last issue was
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