I was one of the people who was able to successfully update using the original 8.1 firmware file that was later taken down without any problems.
Upgated to the newer FW-V3.0.0-2020090714 firmware via wifi 2 nights ago and everything is much, much faster- far faster than the old Android 6 firmware. The update also fixed the built in book reader app that was terrible in that first version of 8.1.
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