Select band and cell lock em12-g

I am not able to select my band 20,1,7 on em12-g?
Can someone say me the commands at to do it?
I tried to use AT+QCFG but I can’t.
I need to select some band and to do a cell lock.

I lunch the command from mikrotik terminal of lhgg
Thanks in advance.

Band-lock to B20? That’s: AT+QCFG="band",0,80000

B1: AT+QCFG="band",0,1
B7: AT+QCFG="band",0,40
B1 + B7 + B20": AT+QCFG="band",0,80041

and so on.