No connection after firmware update

[alexmaron81]

U_CELL: initialising with enable power pin not connected, PWR_ON pin 21 (0x15) (and is toggled from 1 to 0) and VInt pin not connected. AT AT AT AT AT U_CELL_PWR: powering on. [00]AT AT AT AT AT AT AT AT AT [00]AT AT

OK ATE0 ATE0

OK AT+CMEE=2

OK AT+UDCONF=1,0

OK ATI9

M0.12.00,A.02.21

OK AT&C1

OK AT&D0

OK AT+UCGED=5

OK AT&K3

OK AT+UPSV=4

OK AT+CPSMS?

+CPSMS:0,,,"00011000","00001010"

OK AT+CEDRXS?

+CEDRXS: 2,"0010" +CEDRXS: 4,"0010" +CEDRXS: 5,"0010"

OK AT+CEDRXS=2,2

OK AT+CEDRXS=2,4

OK AT+CEDRXS=2,5

OK AT+UMNOPROF?

+UMNOPROF: 0

OK AT+UGPRF?

+UGPRF: 2,0,""

OK AT+CFUN=4

OK Opened device with return code 0. Bringing up the network... U_CELL_NET: preparing to register/connect... AT+CREG=2

OK AT+CGREG=2

OK AT+CEREG=4

OK AT+CIMI

901405103271762

OK U_CELL_NET: user-specified APN is "iot.1nce.net". AT+CGDCONT=1,"IP","iot.1nce.net"

OK U_CELL_NET: setting automatic network selection mode... AT+COPS?

+COPS: 0

OK AT+CFUN=1

OK AT+CREG?

+CREG: 2,0

OK 0: NReg AT+CGREG?

+CGREG: 2,4

OK 0: OoC AT+CEREG?

+CEREG: 4,0

OK 0: NReg AT+CREG?

+CREG: 2,0

OK 0: NReg AT+CGREG?

+CGREG: 2,4

OK 0: OoC AT+CEREG?

+CEREG: 4,0

OK 0: NReg AT+CREG?

+CREG: 2,0

OK 0: NReg AT+CGREG?

+CGREG: 2,4

OK 0: OoC AT+CEREG?

+CEREG: 4,0

OK 0: NReg AT+CREG?

+CREG: 2,0

OK 0: NReg AT+CGREG?

+CGREG: 2,4

OK 0: OoC AT+CEREG?

+CEREG: 4,0

OK 0: NReg AT+CREG?

+CREG: 2,0

OK 0: NReg AT+CGREG?

+CGREG: 2,4

OK 0: OoC AT+CEREG?

+CEREG: 4,0

OK 0: NReg AT+CREG?

+CREG: 2,0

OK 0: NReg AT+CGREG?

+CGREG: 2,4

OK 0: OoC AT+CEREG?

+CEREG: 4,0

OK 0: NReg AT+CREG?

+CREG: 2,0

OK 0: NReg AT+CGREG?

+CGREG: 2,4

OK 0: OoC AT+CEREG?

+CEREG: 4,0

OK 0: NReg AT+CREG?

+CREG: 2,0

OK 0: NReg AT+CGREG?

+CGREG: 2,4

OK 0: OoC AT+CEREG?

+CEREG: 4,0

OK 0: NReg AT+CREG?

+CREG: 2,0

OK 0: NReg AT+CGREG?

+CGREG: 2,4

OK 0: OoC AT+CEREG?

+CEREG: 4,0

OK 0: NReg AT+CREG?

+CREG: 2,0

OK 0: NReg AT+CGREG?

+CGREG: 2,4

OK 0: OoC AT+CEREG?

+CEREG: 4,0

OK 0: NReg AT+CREG?

+CREG: 2,0

OK 0: NReg AT+CGREG?

+CGREG: 2,4

OK 0: OoC AT+CEREG?

+CEREG: 4,0

OK 0: NReg AT+CREG?

+CREG: 2,0

OK 0: NReg AT+CGREG?

+CGREG: 2,4

OK 0: OoC AT+CEREG?

+CEREG: 4,0

OK 0: NReg AT+CREG?

+CREG: 2,0

[alexmaron81]

Ok, now the device got the connection again, but only if I set the following like here (https://github.com/u-blox/ubxlib/issues/25#issuecomment-892903911):

But how does it come about?

[RobMeades]

Hi Alex. Looking at #25, with the virtual network operator of your SIM (1nce) you ended up registered on the physical network of Deutsche Telecom and, I believe, on 2G. If the RAT settings of the module happen to include NBIot, a complete network search can take 10s of minutes, so it might just take a while to get to 2G. Forcing a manual selection on Deutsche Telecom likely cuts through that long process, 'cos you're telling the module exactly what you want.

That's my guess anyway. All 3GPP stuff, not really something ubxlib knows much about I'm afraid.