No Reason to be Alarmed
You might temporarily see these displays or errors during an OTA update, which are normal and do not require intervention:
The LED light turns yellow
The Diagnoser cannot be accessed
The Miner (5s) pages show the error ‘RPC to 'firstname.lastname@example.org' failed’
All of these are temporary and you DO NOT need to do anything. The hotspot will go back to normal on its own once the OTA is complete.