Better Firmware

does anyone with a MBX HD2 5G have an an idea what firmware is best and if so please share.

for MBX 5G we recommend 8.1.3

well I’ve tried it and I don’t care for it it does not allow me to connect to AT&T sims and when it does it has the carrier name as T-Mobile and I don’t get 5G with T-Mobile I barely get LTE

okay, for US I don’t know the provider details. You can call you certified Peplink Partner, they should know about that issue