This worked for me:
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Power off by holding VolumeUP and Power button until phone vibrates once, then three times. Immediately release buttons before phone powers up again.
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With phone off, hold VolumeUP, then connect by USB to computer. (LED turns blue.)
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On my Linux computer, I issued the terminal command:
fastboot devices
(My device ID was then listed in the terminal.)
- I next issued the command:
fastboot reboot
(Phone rebooted into version 1.13, with everything as it was before the 1.14 attempted install.)