@Mar-tin I am using a Jump-Start Power Bank (12 volt battery) for a year now with fast switch between wall socket and the battery. you can also search for any "12v UPS"

@fandangozx I downloaded it. The "One Mesh" disable botton not showing. The problem of this every second in the log is still: USER: Network type is LTE. USER: Network type is LTE PLUS. Internet speed...

No, it is a hardware issue

@PB123 Archer MR600 supports B28 Network Type Link

@francota That is because of Carrier Aggregation in your phone helps achieve better network speed.

@ZdeHou MR600 is supporting CWMP Settings: TR-069