Gl.inet X750 20-40mhz or 20mhz or 40mhz

How can I adjust with the x750 that he outputs 20-40mhz and how only 40mhz and how is only 20mhz? there are at commands for it! Thanks

And what is the At commands for B3+B3 and B7+B7

You can adjust the WIFI bandwidth in LUCI.
Please refer this link to lock LTE band X750 Spitz is there a way to lock to band?

Thanks ! I love gl.inet x750 thanks