Firmware update
Hi can anyone please help. My router is 2 months old and was working fantastic. 5g speeds were great I'm on three network with really good signal . Router upgraded over night no I can't use 5g on 4g been on to three they've given me details about my 5g and said everything was fine . Until the point of firmware change I've tried the router on auto to no avail only connects to bands in b . Not the N like n78 n77 it won't connect at all
I've downloaded the firmware installed it and rebooted the router and the new firmware 1.2.1 is still their.
Any help would be much appreciated.

