Did you reboot the router after the update? Also, there is no such thing as rollback for firmware or NOR (at least not automated and distributed). Schnapps won’t help you in this case.
Yes, I had the same blinking. I think the only thing that might be missing is generating the Reforis request for reboot. I think I reported it already. Just reboot the router and it will get fixed.
You are correct. The green blinking lights are a result of the MCU firmware update. We will make sure to make the process of firmware update more documented.