Thingy91 unable to progress past the update firmware step

[morerook]

Hello,

I am stuck on the step of getting the Thingy91 to start working.

I am following this tutorial: https://www.nordicsemi.com/Products/Development-hardware/Nordic-Thingy-91/GetStarted

I uploaded the Modem firmware with the nRF programmer, followed by the MCU firmware. However, no LED lights are turning on for the Thingy91

I tried to go back to upload the modem firmware again, but when I press the modem's button and turn the device on, I can't find the device, and I am unable to reflash the modem's firmware. The device does not appear on the programmer.

I'm not sure how to proceed from this step.

nRF52 firmware: thingy91_asset_tracker_ltem_2021-06-28_7a076c22.hex

modem firmware: mfw_nrf9160_1.3.0.zip

Thank you

[morerook]

2021-07-13T14:18:13.767Z VERBOSE Could not fetch serial number for serial port at COM5
2021-07-13T14:18:13.767Z VERBOSE Could not fetch serial number for serial port at COM4
2021-07-13T14:18:13.767Z VERBOSE Could not fetch serial number for serial port at COM1
2021-07-13T14:18:14.927Z INFO Modem port is opened
2021-07-13T14:18:14.934Z DEBUG modem >> AT+CFUN?
2021-07-13T14:18:21.330Z DEBUG modem >> AT+COPS=?
2021-07-13T14:18:25.883Z DEBUG modem << +COPS: (1,"","","52501",7)
2021-07-13T14:18:25.886Z DEBUG modem << OK
2021-07-13T14:18:25.898Z DEBUG modem >> AT+COPS?
2021-07-13T14:18:25.911Z DEBUG modem << +CME ERROR: 0
2021-07-13T14:18:25.912Z ERROR Network search failed: Error: AT+COPS?
 failed: phone failure
2021-07-13T14:18:45.680Z DEBUG modem >> AT%XOPERID
2021-07-13T14:18:45.686Z DEBUG modem << %XOPERID: 0
2021-07-13T14:18:45.688Z DEBUG modem << OK
2021-07-13T14:18:51.881Z DEBUG modem >> AT%XMONITOR
2021-07-13T14:18:51.894Z DEBUG modem << %XMONITOR: 2
2021-07-13T14:18:51.896Z DEBUG modem << OK
2021-07-13T14:18:54.643Z DEBUG modem >> AT+CFUN?
2021-07-13T14:18:54.656Z DEBUG modem << +CFUN: 1
2021-07-13T14:18:54.663Z DEBUG modem << OK
2021-07-13T14:18:54.687Z DEBUG modem >> AT+CGMI
2021-07-13T14:18:54.700Z DEBUG modem << Nordic Semiconductor ASA
2021-07-13T14:18:54.701Z DEBUG modem << OK
2021-07-13T14:18:54.704Z DEBUG modem >> AT+CGMM
2021-07-13T14:18:54.717Z DEBUG modem << nRF9160-SICA
2021-07-13T14:18:54.718Z DEBUG modem << OK
2021-07-13T14:18:54.722Z DEBUG modem >> AT+CGMR
2021-07-13T14:18:54.734Z DEBUG modem << mfw_nrf9160_1.3.0
2021-07-13T14:18:54.736Z DEBUG modem << OK
2021-07-13T14:18:54.739Z DEBUG modem >> AT+CEMODE?
2021-07-13T14:18:54.752Z DEBUG modem << +CEMODE: 2
2021-07-13T14:18:54.755Z DEBUG modem << OK
2021-07-13T14:18:54.762Z DEBUG modem >> AT%XCBAND=?
2021-07-13T14:18:54.779Z DEBUG modem << %XCBAND: (1,2,3,4,5,8,12,13,18,19,20,25,26,28,66)
2021-07-13T14:18:54.780Z DEBUG modem << OK
2021-07-13T14:18:54.788Z DEBUG modem >> AT+CMEE?
2021-07-13T14:18:54.795Z DEBUG modem << +CMEE: 1
2021-07-13T14:18:54.796Z DEBUG modem << OK
2021-07-13T14:18:54.800Z DEBUG modem >> AT+CNEC?
2021-07-13T14:18:54.808Z DEBUG modem << +CNEC: 24
2021-07-13T14:18:54.809Z DEBUG modem << OK
2021-07-13T14:18:54.813Z DEBUG modem >> AT+CGEREP?
2021-07-13T14:18:54.819Z DEBUG modem << +CGEREP: 1,0
2021-07-13T14:18:54.822Z DEBUG modem << OK
2021-07-13T14:18:54.826Z DEBUG modem >> AT+CIND=1,1,1
2021-07-13T14:18:54.834Z DEBUG modem << OK
2021-07-13T14:18:54.836Z DEBUG modem >> AT+CEREG=5
2021-07-13T14:18:54.848Z DEBUG modem << OK
2021-07-13T14:18:54.850Z DEBUG modem >> AT+CEREG?
2021-07-13T14:18:54.865Z DEBUG modem << +CEREG: 5,2
2021-07-13T14:18:54.867Z DEBUG modem << OK
2021-07-13T14:18:54.871Z DEBUG modem >> AT%CESQ=1
2021-07-13T14:18:54.882Z DEBUG modem << OK
2021-07-13T14:18:54.885Z DEBUG modem >> AT+CESQ
2021-07-13T14:18:54.898Z DEBUG modem << +CESQ: 99,99,255,255,11,45
2021-07-13T14:18:54.900Z DEBUG modem << OK
2021-07-13T14:18:54.908Z DEBUG modem >> AT%XSIM=1
2021-07-13T14:18:54.919Z DEBUG modem << OK
2021-07-13T14:18:54.923Z DEBUG modem >> AT%XSIM?
2021-07-13T14:18:54.935Z DEBUG modem << %XSIM: 1
2021-07-13T14:18:54.936Z DEBUG modem << OK
2021-07-13T14:18:54.944Z DEBUG modem >> AT+CPIN?
2021-07-13T14:18:54.956Z DEBUG modem << +CPIN: READY
2021-07-13T14:18:54.957Z DEBUG modem << OK
2021-07-13T14:18:54.961Z DEBUG modem >> AT+CPINR="SIM PIN"
2021-07-13T14:18:54.980Z DEBUG modem << +CPINR: "SIM PIN",3
2021-07-13T14:18:54.981Z DEBUG modem << OK
2021-07-13T14:19:10.929Z DEBUG modem >> AT%XMONITOR
2021-07-13T14:19:10.942Z DEBUG modem << %XMONITOR: 2
2021-07-13T14:19:10.943Z DEBUG modem << OK
2021-07-13T14:19:44.764Z DEBUG modem << %CESQ: 44,2,9,1
2021-07-13T14:20:45.886Z DEBUG modem >> AT%XMONITOR
2021-07-13T14:20:45.893Z DEBUG modem << %XMONITOR: 2
2021-07-13T14:20:45.894Z DEBUG modem << OK
2021-07-13T14:20:46.201Z DEBUG modem << %CESQ: 46,2,14,2
2021-07-13T14:21:12.439Z DEBUG modem >> AT+CFUN?
2021-07-13T14:21:12.448Z DEBUG modem << +CFUN: 1
2021-07-13T14:21:12.451Z DEBUG modem << OK
2021-07-13T14:21:12.469Z DEBUG modem >> AT+CGMI
2021-07-13T14:21:12.476Z DEBUG modem << Nordic Semiconductor ASA
2021-07-13T14:21:12.478Z DEBUG modem << OK
2021-07-13T14:21:12.480Z DEBUG modem >> AT+CGMM
2021-07-13T14:21:12.488Z DEBUG modem << nRF9160-SICA
2021-07-13T14:21:12.489Z DEBUG modem << OK
2021-07-13T14:21:12.491Z DEBUG modem >> AT+CGMR
2021-07-13T14:21:12.497Z DEBUG modem << mfw_nrf9160_1.3.0
2021-07-13T14:21:12.499Z DEBUG modem << OK
2021-07-13T14:21:12.501Z DEBUG modem >> AT+CEMODE?
2021-07-13T14:21:12.507Z DEBUG modem << +CEMODE: 2
2021-07-13T14:21:12.511Z DEBUG modem << OK
2021-07-13T14:21:12.517Z DEBUG modem >> AT%XCBAND=?
2021-07-13T14:21:12.526Z DEBUG modem << %XCBAND: (1,2,3,4,5,8,12,13,18,19,20,25,26,28,66)
2021-07-13T14:21:12.527Z DEBUG modem << OK
2021-07-13T14:21:12.534Z DEBUG modem >> AT+CMEE?
2021-07-13T14:21:12.539Z DEBUG modem << +CMEE: 1
2021-07-13T14:21:12.540Z DEBUG modem << OK
2021-07-13T14:21:12.542Z DEBUG modem >> AT+CNEC?
2021-07-13T14:21:12.550Z DEBUG modem << +CNEC: 24
2021-07-13T14:21:12.551Z DEBUG modem << OK
2021-07-13T14:21:12.554Z DEBUG modem >> AT+CGEREP?
2021-07-13T14:21:12.561Z DEBUG modem << +CGEREP: 1,0
2021-07-13T14:21:12.561Z DEBUG modem << OK
2021-07-13T14:21:12.567Z DEBUG modem >> AT+CIND=1,1,1
2021-07-13T14:21:12.574Z DEBUG modem << OK
2021-07-13T14:21:12.577Z DEBUG modem >> AT+CEREG=5
2021-07-13T14:21:12.582Z DEBUG modem << OK
2021-07-13T14:21:12.584Z DEBUG modem >> AT+CEREG?
2021-07-13T14:21:12.590Z DEBUG modem << +CEREG: 5,2
2021-07-13T14:21:12.592Z DEBUG modem << OK
2021-07-13T14:21:12.598Z DEBUG modem >> AT%CESQ=1
2021-07-13T14:21:12.604Z DEBUG modem << OK
2021-07-13T14:21:12.609Z DEBUG modem >> AT+CESQ
2021-07-13T14:21:12.616Z DEBUG modem << +CESQ: 99,99,255,255,13,47
2021-07-13T14:21:12.617Z DEBUG modem << OK
2021-07-13T14:21:12.623Z DEBUG modem >> AT%XSIM=1
2021-07-13T14:21:12.629Z DEBUG modem << OK
2021-07-13T14:21:12.632Z DEBUG modem >> AT%XSIM?
2021-07-13T14:21:12.638Z DEBUG modem << %XSIM: 1
2021-07-13T14:21:12.639Z DEBUG modem << OK
2021-07-13T14:21:12.646Z DEBUG modem >> AT+CPIN?
2021-07-13T14:21:12.652Z DEBUG modem << +CPIN: READY
2021-07-13T14:21:12.653Z DEBUG modem << OK
2021-07-13T14:21:12.660Z DEBUG modem >> AT+CPINR="SIM PIN"
2021-07-13T14:21:12.673Z DEBUG modem << +CPINR: "SIM PIN",3
2021-07-13T14:21:12.674Z DEBUG modem << OK
2021-07-13T14:21:56.998Z DEBUG modem >> AT+CSQ?
2021-07-13T14:21:57.004Z DEBUG modem << +CME ERROR: 0
2021-07-13T14:21:57.007Z ERROR Error: AT+CSQ?
 failed: phone failure
2021-07-13T14:22:04.423Z DEBUG modem >> AT+CSQ
2021-07-13T14:22:04.435Z DEBUG modem << +CSQ: 99,99
2021-07-13T14:22:04.437Z DEBUG modem << OK
2021-07-13T14:22:37.357Z DEBUG modem >> AT+COPS=?
2021-07-13T14:24:29.915Z DEBUG modem << +COPS: (1,"","","52501",7)
2021-07-13T14:24:29.917Z DEBUG modem << OK
2021-07-13T14:24:29.920Z DEBUG modem >> AT+COPS?
2021-07-13T14:24:29.932Z DEBUG modem << +COPS: 0
2021-07-13T14:24:29.933Z DEBUG modem << OK

[Albrecht Markus Schellenberger]

I was honestly expecting something more similar to this:

2021-07-14T04:22:31.395Z DEBUG modem << *** Booting Zephyr OS build v2.6.0-rc1-ncs1  ***
2021-07-14T04:22:31.405Z DEBUG modem << Flash regionsDomainPermissions
2021-07-14T04:22:31.407Z DEBUG modem << 00 01 0x00000 0x10000 Securerwxl
2021-07-14T04:22:31.408Z DEBUG modem << 02 31 0x10000 0x100000 Non-Securerwxl
2021-07-14T04:22:31.411Z DEBUG modem << Non-secure callable region 0 placed in flash region 1 with size 32.
2021-07-14T04:22:31.462Z DEBUG modem << SRAM regionDomainPermissions
2021-07-14T04:22:31.465Z DEBUG modem << 00 07 0x00000 0x10000 Securerwxl
2021-07-14T04:22:31.469Z DEBUG modem << 08 31 0x10000 0x40000 Non-Securerwxl
2021-07-14T04:22:31.471Z DEBUG modem << PeripheralDomainStatus
2021-07-14T04:22:31.475Z DEBUG modem << 00 NRF_P0               Non-SecureOK
2021-07-14T04:22:31.478Z DEBUG modem << 01 NRF_CLOCK            Non-SecureOK
2021-07-14T04:22:31.482Z DEBUG modem << 02 NRF_RTC0             Non-SecureOK
2021-07-14T04:22:31.486Z DEBUG modem << 03 NRF_RTC1             Non-SecureOK
2021-07-14T04:22:31.488Z DEBUG modem << 04 NRF_NVMC             Non-SecureOK
2021-07-14T04:22:31.492Z DEBUG modem << 05 NRF_UARTE1           Non-SecureOK
2021-07-14T04:22:31.495Z DEBUG modem << 06 NRF_UARTE2           SecureSKIP
2021-07-14T04:22:31.499Z DEBUG modem << 07 NRF_TWIM2            Non-SecureOK
2021-07-14T04:22:31.502Z DEBUG modem << 08 NRF_SPIM3            Non-SecureOK
2021-07-14T04:22:31.506Z DEBUG modem << 09 NRF_TIMER0           Non-SecureOK
2021-07-14T04:22:31.511Z DEBUG modem << 10 NRF_TIMER1           Non-SecureOK
2021-07-14T04:22:31.513Z DEBUG modem << 11 NRF_TIMER2           Non-SecureOK
2021-07-14T04:22:31.517Z DEBUG modem << 12 NRF_SAADC            Non-SecureOK
2021-07-14T04:22:31.519Z DEBUG modem << 13 NRF_PWM0             Non-SecureOK
2021-07-14T04:22:31.523Z DEBUG modem << 14 NRF_PWM1             Non-SecureOK
2021-07-14T04:22:31.526Z DEBUG modem << 15 NRF_PWM2             Non-SecureOK
2021-07-14T04:22:31.530Z DEBUG modem << 16 NRF_PWM3             Non-SecureOK
2021-07-14T04:22:31.535Z DEBUG modem << 17 NRF_WDT              Non-SecureOK
2021-07-14T04:22:31.537Z DEBUG modem << 18 NRF_IPC              Non-SecureOK
2021-07-14T04:22:31.541Z DEBUG modem << 19 NRF_VMC              Non-SecureOK
2021-07-14T04:22:31.543Z DEBUG modem << 20 NRF_FPU              Non-SecureOK
2021-07-14T04:22:31.548Z DEBUG modem << 21 NRF_EGU1             Non-SecureOK
2021-07-14T04:22:31.550Z DEBUG modem << 22 NRF_EGU2             Non-SecureOK
2021-07-14T04:22:31.554Z DEBUG modem << 23 NRF_DPPIC            Non-SecureOK
2021-07-14T04:22:31.559Z DEBUG modem << 24 NRF_REGULATORS       Non-SecureOK
2021-07-14T04:22:31.562Z DEBUG modem << 25 NRF_PDM              Non-SecureOK
2021-07-14T04:22:31.565Z DEBUG modem << 26 NRF_I2S              Non-SecureOK
2021-07-14T04:22:31.568Z DEBUG modem << 27 NRF_GPIOTE1          Non-SecureOK
2021-07-14T04:22:31.571Z DEBUG modem << SPM: NS image at 0x10000
2021-07-14T04:22:31.573Z DEBUG modem << SPM: NS MSP at 0x2001c788
2021-07-14T04:22:31.577Z DEBUG modem << SPM: NS reset vector at 0x12e89
2021-07-14T04:22:31.579Z DEBUG modem << SPM: prepare to jump to Non-Secure image.
2021-07-14T04:22:31.786Z DEBUG modem << *** Booting Zephyr OS build v2.6.0-rc1-ncs1  ***
2021-07-14T04:22:31.791Z DEBUG modem << The AT host sample started
2021-07-14T04:22:47.971Z DEBUG modem >> AT+CFUN?
2021-07-14T04:22:47.982Z DEBUG modem << +CFUN: 0
2021-07-14T04:22:47.990Z DEBUG modem << OK
2021-07-14T04:22:49.130Z DEBUG modem >> AT+CFUN=1
2021-07-14T04:22:49.172Z DEBUG modem << OK
2021-07-14T04:22:50.219Z DEBUG modem >> AT+CFUN?
2021-07-14T04:22:50.229Z DEBUG modem << +CFUN: 1
2021-07-14T04:22:50.234Z DEBUG modem << OK
2021-07-14T04:22:50.238Z DEBUG modem >> AT+CGSN=1
2021-07-14T04:22:50.249Z DEBUG modem << +CGSN: "352656106118402"
2021-07-14T04:22:50.250Z DEBUG modem << OK
2021-07-14T04:22:50.253Z DEBUG modem >> AT+CGMI
2021-07-14T04:22:50.264Z DEBUG modem << Nordic Semiconductor ASA
2021-07-14T04:22:50.267Z DEBUG modem << 
2021-07-14T04:22:50.268Z DEBUG modem << OK
2021-07-14T04:22:50.271Z DEBUG modem >> AT+CGMM
2021-07-14T04:22:50.281Z DEBUG modem << nRF9160-SICA
2021-07-14T04:22:50.285Z DEBUG modem << OK
2021-07-14T04:22:50.287Z DEBUG modem >> AT+CGMR
2021-07-14T04:22:50.298Z DEBUG modem << mfw_nrf9160_1.3.0
2021-07-14T04:22:50.299Z DEBUG modem << 
2021-07-14T04:22:50.300Z DEBUG modem << OK
2021-07-14T04:22:50.300Z INFO Nordic Semiconductor ASA nRF9160-SICA [mfw_nrf9160_1.3.0] SerNr: 352656106118402
2021-07-14T04:22:50.303Z DEBUG modem >> AT+CEMODE?
2021-07-14T04:22:50.307Z DEBUG modem << +CEMODE: 2
2021-07-14T04:22:50.311Z DEBUG modem << 
2021-07-14T04:22:50.312Z DEBUG modem << OK
2021-07-14T04:22:50.318Z DEBUG modem >> AT%XCBAND=?
2021-07-14T04:22:50.328Z DEBUG modem << %XCBAND: (1,2,3,4,5,8,12,13,18,19,20,25,26,28,66)
2021-07-14T04:22:50.329Z DEBUG modem << OK
2021-07-14T04:22:50.336Z DEBUG modem >> AT+CMEE?
2021-07-14T04:22:50.340Z DEBUG modem << +CMEE: 0
2021-07-14T04:22:50.342Z DEBUG modem << OK
2021-07-14T04:22:50.346Z DEBUG modem >> AT+CMEE=1
2021-07-14T04:22:50.352Z DEBUG modem << OK
2021-07-14T04:22:50.356Z DEBUG modem >> AT+CNEC?
2021-07-14T04:22:50.360Z DEBUG modem << +CNEC: 0
2021-07-14T04:22:50.361Z DEBUG modem << OK
2021-07-14T04:22:50.365Z DEBUG modem >> AT+CNEC=24
2021-07-14T04:22:50.370Z DEBUG modem << OK
2021-07-14T04:22:50.373Z DEBUG modem >> AT+CGEREP?
2021-07-14T04:22:50.378Z DEBUG modem << +CGEREP: 0,0
2021-07-14T04:22:50.379Z DEBUG modem << 
2021-07-14T04:22:50.379Z DEBUG modem << OK
2021-07-14T04:22:50.382Z DEBUG modem >> AT+CGDCONT?
2021-07-14T04:22:50.389Z DEBUG modem << +CGDCONT: 0,"","","",0,0
2021-07-14T04:22:50.390Z DEBUG modem << OK
2021-07-14T04:22:50.397Z DEBUG modem >> AT+CGACT?
2021-07-14T04:22:50.401Z DEBUG modem << +CGACT: 0,0
2021-07-14T04:22:50.403Z DEBUG modem << OK
2021-07-14T04:22:50.409Z DEBUG modem >> AT+CGEREP=1
2021-07-14T04:22:50.413Z DEBUG modem << OK
2021-07-14T04:22:50.419Z DEBUG modem >> AT+CIND=1,1,1
2021-07-14T04:22:50.425Z DEBUG modem << OK
2021-07-14T04:22:50.428Z DEBUG modem >> AT+CEREG=5
2021-07-14T04:22:50.432Z DEBUG modem << OK
2021-07-14T04:22:50.434Z DEBUG modem >> AT+CEREG?
2021-07-14T04:22:50.440Z DEBUG modem << +CEREG: 5,2,"7AA9","01444000",7
2021-07-14T04:22:50.445Z DEBUG modem << OK
2021-07-14T04:22:50.452Z DEBUG modem >> AT%CESQ=1
2021-07-14T04:22:50.457Z DEBUG modem << OK
2021-07-14T04:22:50.459Z DEBUG modem >> AT+CESQ
2021-07-14T04:22:50.464Z DEBUG modem << +CESQ: 99,99,255,255,21,42
2021-07-14T04:22:50.467Z DEBUG modem << OK
2021-07-14T04:22:50.470Z DEBUG modem >> AT%XSIM=1
2021-07-14T04:22:50.475Z DEBUG modem << OK
2021-07-14T04:22:50.477Z DEBUG modem >> AT%XSIM?
2021-07-14T04:22:50.481Z DEBUG modem << %XSIM: 1
2021-07-14T04:22:50.482Z DEBUG modem << OK
2021-07-14T04:22:50.488Z DEBUG modem >> AT+CPIN?
2021-07-14T04:22:50.492Z DEBUG modem << +CPIN: READY
2021-07-14T04:22:50.494Z DEBUG modem << OK
2021-07-14T04:22:50.500Z DEBUG modem >> AT+CPINR="SIM PIN"
2021-07-14T04:22:50.511Z DEBUG modem << +CPINR: "SIM PIN",3
2021-07-14T04:22:50.513Z DEBUG modem << OK
2021-07-14T04:22:50.519Z DEBUG modem >> AT+CIMI
2021-07-14T04:22:50.524Z DEBUG modem << 204080813636280
2021-07-14T04:22:50.525Z DEBUG modem << OK
2021-07-14T04:22:50.526Z INFO IMSIdentity: 204080813636280
2021-07-14T04:22:50.594Z DEBUG modem << %CESQ: 42,2,22,3
2021-07-14T04:22:52.600Z DEBUG modem << +CGEV: ME PDN ACT 0,0
2021-07-14T04:22:52.608Z DEBUG modem >> AT+CGDCONT?
2021-07-14T04:22:52.609Z DEBUG modem << +CNEC_ESM: 50,0
2021-07-14T04:22:52.610Z DEBUG modem << +CEREG: 5,"7AA9","01444000",7,,,"11100000","11100000"
2021-07-14T04:22:52.615Z DEBUG modem << +CIND: "service",1
2021-07-14T04:22:52.616Z DEBUG modem << +CIND: "roam",1
2021-07-14T04:22:52.617Z DEBUG modem << +CGDCONT: 0,"IP","ibasis.iot","10.160.62.106",0,0
2021-07-14T04:22:52.618Z DEBUG modem << OK
2021-07-14T04:22:52.621Z DEBUG modem >> AT+CGACT?
2021-07-14T04:22:52.626Z DEBUG modem << +CGACT: 0,1
2021-07-14T04:22:52.629Z DEBUG modem << OK

Have you initiated the AT Client testing sequence with Automatic requests enabled by setting the modem to full functionality and afterwards reading the current functional mode? 

2021-07-14T04:22:49.130Z DEBUG modem >> AT+CFUN=1
2021-07-14T04:22:49.172Z DEBUG modem << OK
2021-07-14T04:22:50.219Z DEBUG modem >> AT+CFUN?
2021-07-14T04:22:50.229Z DEBUG modem << +CFUN: 1
2021-07-14T04:22:50.234Z DEBUG modem << OK

What I’m interested in is how this line looks with your device:

2021-07-14T04:22:52.610Z DEBUG modem << +CEREG: 5,"7AA9","01444000",7,,,"11100000","11100000"

Regards,

Markus

[morerook]

Hello Marcus, if you see line 19 CFUN is set to 1.

Based on the information you sent I ran AT%XMONITOR which returned %XMONITOR: 2, which means that it is scanning and has not connected to the network yet.

Running AT+CEREG? returns +CEREG: 5,2 which means that it is attempting to registering but not registered to the network. So I'll never reach the +CEREG command you showed because my device is always stuck on this step

[morerook]

Should I load the debug version of the at_client?

[morerook]

I don't get this line:

2021-07-14T04:22:31.395Z DEBUG modem << *** Booting Zephyr OS build v2.6.0-rc1-ncs1  ***
2021-07-14T04:22:31.405Z DEBUG modem << Flash regionsDomainPermissions
2021-07-14T04:22:31.407Z DEBUG modem << 00 01 0x00000 0x10000 Securerwxl
2021-07-14T04:22:31.408Z DEBUG modem << 02 31 0x10000 0x100000 Non-Securerwxl
2021-07-14T04:22:31.411Z DEBUG modem << Non-secure callable region 0 placed in flash region 1 with size 32.
2021-07-14T04:22:31.462Z DEBUG modem << SRAM regionDomainPermissions
2021-07-14T04:22:31.465Z DEBUG modem << 00 07 0x00000 0x10000 Securerwxl
2021-07-14T04:22:31.469Z DEBUG modem << 08 31 0x10000 0x40000 Non-Securerwxl
2021-07-14T04:22:31.471Z DEBUG modem << PeripheralDomainStatus

Which file am I supposed to flash to the Thingy91?

I flashed thingy91_fw_2021-06-28_7a076c22\img_fota_dfu_hex\thingy91_at_client_2021-06-28_7a076c22.hex to the device, but I don't get the Zephyr OS output