I need to upgrade the modem fw. on two TRB500 units - they are unable to register on 5G (only working in 4g only mode). Modem fw. on both devices is RG501QEUAAR12A05M4G, which is quite old.
I have another TRB500 which is using A12 modem fw. - this one is working in 5G.
Please advise how to proceed with the modem fw. upgrade.
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