Have you tried placing demetris update .Tar in storage/.update with a .nocompap file?
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If this was in response to me asking about trying to update from 7.0.3 yes. the update works, installs 8.0.1 but will not fully boot. It connects to the same internet and everything, but hangs on the screen with amlogic ir dummy files.
I was able to get past this by using the toothpick into recovery and wiped the Data and Cache then reboot. It was able to reboot without a problem. Then if I tried to install the backup TAR file it would go back to hanging on the boot.