Ok, good news. Using "fastboot flash boot nnglow21.img"and "fastboot reboot" I was able to get it into recovery successfully. This time "update-binary 2 1 /data/media/0/update.zip" worked and the device rebooted as expected. I didn't have to create recovery in /cache as it already existed. Upon setting up the device it immediately started updating to 8.1.4.45 and now it appears as if the device is back to oem as it's no longer rooted (assuming it was rooted in the first place, I couldn't check in time). Should I reattempt to root the device? I had assumed that the latest update was already installed and that it would be safe to connect to wifi. thank you
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