If you install Rooter firmware or openwrt changing bands would be easy
AT+QCFG="band",0,8000000
I have a Lua script available for download to calculate LTE and NR5G bandmasks: https://pastebin.com/xcj6MVA2
Example:
encodemask 3 7 28
00000000000000000000000008000044
The script is included with ROOter.
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Thanks btw itβs working well