TRB500 not connecting on 5G after firmware update - Modem Firmware solution not working

I was asked to apply a solution to my TRB500 gateway, but

the firmware update is failing
Any other solution to make this update work?

I had the same issue. The modem upgrader seems to be a bit finicky. Try several times and it should work eventually. Disconnecting the modem or switching to 4G will help too.

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