So, update! Managed to get replacement of the device from the vendor, device marked as faulted, I got a new one. And... Yes, still not working on band 20! Connected on band 3, but not on band 20. Carrier is 02 CZ, but tested also T-Mobile CZ and Vodafone CZ and all the same - working on 1800 MHz, but not on 800 MHz.
10:14:55 system,info device changed by admin
10:14:57 lte,async lte1: sent ATE0
10:14:57 lte,async lte1: rcvd OK
10:14:57 lte,debug band change
10:14:57 lte,async lte1: sent AT+CFUN=0,1
10:14:58 lte,async lte1: rcvd OK
10:15:19 lte,async lte1: sent ATE0
10:15:21 lte,async lte1: sent ATE0
10:15:21 lte,async lte1: rcvd OK
10:15:21 lte,async lte1: sent AT+CFUN?
10:15:21 lte,async lte1: rcvd +CFUN: 0
10:15:21 lte,async lte1: sent AT+CMEE=2
10:15:21 lte,async,event %CMEEU: 2
10:15:21 lte,async lte1: rcvd OK
10:15:21 lte,async lte1: sent AT+CREG=2
10:15:21 lte,async lte1: rcvd OK
10:15:21 lte,async lte1: sent AT+CGREG=2
10:15:21 lte,async lte1: rcvd +CME ERROR: operation not supported
10:15:21 lte,async lte1: sent AT+CEREG=2
10:15:21 lte,async lte1: rcvd OK
10:15:21 lte,async lte1: sent AT+CGEREP=2,0
10:15:21 lte,async lte1: rcvd OK
10:15:21 lte,async lte1: sent AT+CMGF=0
10:15:21 lte,async lte1: rcvd OK
10:15:21 lte,async lte1: sent AT+CNMI=1,1,0,1,0
10:15:21 lte,async lte1: rcvd OK
10:15:21 lte,async lte1: sent AT+CPIN?
10:15:21 lte,async lte1: rcvd +CPIN: READY
10:15:21 lte,async lte1: sent AT+CFUN=1
10:15:21 lte,async,raw +CEREG: 2
10:15:21 lte,async lte1: rcvd OK
10:15:25 lte,async lte1: sent AT+CPMS="SM","SM","SM"
10:15:25 lte,async lte1: rcvd +CPMS: 0,10,0,10,0,10
10:15:25 lte,async lte1: sent AT+CFUN?
10:15:25 lte,async lte1: rcvd +CFUN: 1
10:15:25 lte,async lte1: sent AT+CNUM
10:15:25 lte,async lte1: rcvd
10:15:25 lte,async lte1: sent AT+CIMI
10:15:25 lte,async lte1: rcvd 230020201238478
10:15:25 lte,async lte1: sent AT+CPIN?
10:15:25 lte,async lte1: rcvd +CPIN: READY
10:15:25 lte,async lte1: sent AT%PDNSET=1,"internet","IP","NONE","",""
10:15:25 lte,async lte1: rcvd OK
10:15:26 lte,async lte1: sent at%cmatt=1
10:15:26 lte,async lte1: rcvd OK
10:15:26 lte,debug lte1: config ok
10:15:26 lte,async,raw lte1: sent AT+CFUN?
10:15:26 lte,async,raw lte1: rcvd +CFUN: 1
10:15:26 lte,async,raw lte1: sent AT%MEAS="7"
10:15:26 lte,async,raw lte1: rcvd CQI: N/A
10:15:26 lte,async,raw lte1: sent AT%MEAS="8"
10:15:26 lte,async,raw lte1: rcvd Signal Quality: RSRP = N/A, RSRQ = N/A, SINR = N/A, RSSI = N/A
10:15:26 lte,async,raw lte1: sent AT%PCONI
10:15:26 lte,async,raw lte1: rcvd +CME ERROR: Not camped on cell
10:15:27 lte,async,raw +CEREG: 0
10:15:29 lte,async,raw lte1: sent AT%MEAS="7"
10:15:29 lte,async,raw lte1: rcvd CQI: N/A
10:15:29 lte,async,raw lte1: sent AT%MEAS="8"
10:15:29 lte,async,raw lte1: rcvd Signal Quality: RSRP = N/A, RSRQ = N/A, SINR = N/A, RSSI = N/A
10:15:29 lte,async,raw lte1: sent AT%PCONI
10:15:29 lte,async,raw lte1: rcvd +CME ERROR: Not camped on cell
10:15:30 lte,async,raw +CEREG: 2
10:15:32 lte,async,raw lte1: sent AT%MEAS="7"
10:15:32 lte,async,raw lte1: rcvd CQI: N/A
10:15:32 lte,async,raw lte1: sent AT%MEAS="8"
10:15:32 lte,async,raw lte1: rcvd Signal Quality: RSRP = N/A, RSRQ = N/A, SINR = N/A, RSSI = N/A
10:15:32 lte,async,raw lte1: sent AT%PCONI
10:15:32 lte,async,raw lte1: rcvd +CME ERROR: Not camped on cell
Everything latest SW versions - RouterOS, firmware, modem card firmware...
Quite a pity, looks like a bigger problem of this modem card, there are many posts around similar to mine complaining abot non-functionality on Band 20. I am going to return even this device to the vendor and ask for money back.
Continuing to search for another LTE Band 20 standalone modem that would enable BTS locking and full control of other connnection parameters...