RM520NGLAAR01A07M4G with EZR34T-5G

Losing connection LTE, can’t get running 5G.
UK, Three network, any suggestions will be appreciated.
Will firmware update help with this?

I will send you the R01A08 but I don’t think it is the problem of the firmware.
With your phone, could it register the 5G?
Are all the 4 antenna connected?

5G works with phone, I got 3 antennas connected to 1,2 and 3.

If possible please make sure there are 4 antennas.
I have sent you the lastest R01A08.

I have just 3 antennas which is the best way to connect them?

The antenna0 must be connected.
You can just try
0 1 2
0 1 3
0 2 3

And please check
AT+QNWPREFCFG=“mode_pref”