I have a RUT955 router which will not recognise my Virgin Media SIM - a SIM which I use all the time without problems in my phone. It has been suggested on the Teltonika forum that a firmware upgrade may sort out the problem, so I tried upgrading from RUT9_R_00.07.00 to the latest firware
but I couldn't get this to work.
Can anyone tell me if/how I could perform this upgrade via ssh?
Apparently the latest upgrade also installs OpenWrt v21.02.
I'm not sure how to display the current firmware from a shell. I thought it might be in /etc/os-release but it isn't.