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’
The hotspot blockchain height shows ‘unknown’
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.