Switch Em12-g to band 3+band 20

Hello . I want to change modem em12-g to band 3 + band 20

As documentation i am use command


But appling these command in Qnavigator work with error.

Hopw can i switch modem to band 3 + band 20 ?

Use AT+QCFG="band",0,80004

Your 800004 band bitmask encodes for B3 + B24.