thanks，the band change usually was automatically, why do you need manual change/lock the band ?Quectel_EC20_AT_Commands_Manual
and manual at-chat
4.3.6. AT+QCFG="band" Band Configuration
6.9. AT+QNWINFO Query Network Information
the lte module in video is “r11e lte“，it's made by mikrotik, so can support the band select function, many other brand can't supportI found the YT clip with show the full settings with band. Mikrotik SXT LTE v2 Dual SIM & Band Select
In this https://wiki.mikrotik.com/wiki/Dual_SIM_Application
I ask because the in https://wiki.mikrotik.com/wiki/Manual:TOC I cannot found description of this options in /system routerboard modem
Thanks，however use the rssi or rsrp,the script can't switch theBut, please, use RSRP for indication of signal strength ... RSSI includes also all the interference.