Plug in the phone to PC and open a terminal in the platform tools folder
adb reboot recovery
Tap power and volume up to get into recovery mode
Apply update from ADB
adb sideload <ota.zip>
Note: use the 'copy as path' function with the .zip file and paste it instead of 'ota.zip'
After the update completes press power to reboot to system.
For root check out the post here
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