@kitkatSG @LudwigBAH Copying my response from another thread:

Here is an example of how to send an AT command to the Quectel modem:

echo -ne "AT+QNWPREFCFG=\"mode_pref\",LTE:NR5G\r" | busybox microcom -t 1000 /dev/ttyUSB2

The above gets ran as part of rb5-modem in order to set the network preference to allow both LTE and 5G.

Here is a link to the Quectel RM5* series modem AT command manual, you can probably find a relevant AT command to use there: https://www.quectel.com/wp-content/uploads/2021/05/Quectel_RG50xQRM5xxQ_Series_AT_Commands_Manual_V1.2.pdf