Problem:
When trying to do a Tasmota firmware upgrade on the Nous A1T, you see this error message:
Upload Failed Upload buffer miscompare
Solution:
This issue occurs because in the default configuration there is not enough flash space to flash the firmware.
However, this is easy to fix: First, flash the tasmota-minimal.bin.gz firmware, then flash the regular tasmota.bin.gz firmware using the webinterface of the minimal firmware.
Download link for the minimal firmware
Download link for the regular firmware
After that, upgrades will work just fine.