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:
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The LED light turns yellow
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The Diagnoser cannot be accessed
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The Miner (5s) pages show the error ‘RPC to 'miner@127.0.0.1' 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.