NEW DEVICE Switched on: LED3 blinking: does not communicate with LTE Link Monitor On nrfcloud.com I tried to register as: 352656100221921 CA:08:D5:0D:5F:7E I get: There was an error adding your device. You might be trying to upgrade an older nRF91 development kit. Unless you update your device, you will have to click the "Have an old devkit without a PIN?" link below. I click the link and get: Power on your LTE device and make sure it is connecting (this could take up to 3 minutes). When your device has a connection to an LTE tower, LED 3 and LED 4 should be blinking. Click 'Next' below to move on to the pairing procedure. I switch the unit off and on again and wait five minutes. Nothing happens Before following the instructions on: https://devzone.nordicsemi.com/nordic/cellular-iot-guides/b/getting-started-cellular/posts/nrf-cloud-certificate-update I try to program the app compiled by me with the NB-IoT configuration to see if anything changes. SES asks to update the fimware of the emulator; I answer YES. The LTE Link monitor gets no answer. I press RESET. I get: SPM: NS image at 0xc000 SPM: NS MSP at 0x2002ad60 SPM: NS reset vector at 0x13db5 SPM: prepare to jump to Non-Secure image. ***** Booting Zephyr OS v1.14.99-ncs2 ***** Application started LTE LC config ... ASSERTION FAIL [err == 0] @ ../src/main.c:981 LTE link could not be established. ***** Kernel Panic! ***** Current thread ID = 0x20023570 Faulting instruction address = 0x2e354 Still the LTE Link monitor gets no answer. At this point I try to program the nrf9160dk_asset_tracker_09-10-2019_c9c833b1.hex file with nRF Programmer The unit keeps rebooting and does not give me time to enter commands: SPM: NS image at 0xc000 SPM: NS MSP at 0x2002c800 SPM: NS reset vector at 0x127a9 SPM: prepare to jump to Non-Secure image. ***** Booting Zephyr OS build v1.14.99-ncs3-snapshot2-2647-gd6e67554cfeb ***** [00:00:00.353,576] [1;31m nrf9160_gps: Could not confiugure MAGPIO, error: -8[0m Asset tracker started[00:00:00.364,227] [0m nrf_cloud_transport.nct_client_id_get: client_id = nrf-352656100221921[0m [00:00:00.373,565] [0m nrf_cloud_transport.nct_topics_populate: shadow_base_topic: $aws/things/nrf-352656100221921/shadow[0m [00:00:00.385,314] [0m nrf_cloud_transport.nct_topics_populate: accepted_topic: $aws/things/nrf-352656100221921/shadow/get/accepted[0m [00:00:00.397,979] [0m nrf_cloud_transport.nct_topics_populate: rejected_topic: $aws/things/nrf-352656100221921/shadow/get/rejected[0m [00:00:00.410,614] [0m nrf_cloud_transport.nct_topics_populate: update_delta_topic: $aws/things/nrf-352656100221921/shadow/update/delta[0m [00:00:00.423,614] [0m nrf_cloud_transport.nct_topics_populate: update_topic: $aws/things/nrf-352656100221921/shadow/update[0m [00:00:00.435,546] [0m nrf_cloud_transport.nct_topics_populate: shadow_get_topic: $aws/things/nrf-352656100221921/shadow/get[0m Connecting to LTE network. This may take several minutes. [00:00:00.453,521] [0m lte_lc.w_lte_lc_connect: Network mode: AT%XSYSTEMMODE=1,0,1,0[0m LTE link could not be established. ***** Booting Zephyr OS build v1.14.99-ncs3-snapshot2-2647-gd6e67554cfeb ***** I try to program the merged.hex file of my application via nRF Programmer I still get the same assertion failed from the code: printk("LTE LC config ...\n"); display_state = LEDS_CONNECTING; err = lte_lc_init_and_connect(); __ASSERT(err == 0, "LTE link could not be established."); I start to suspect the the Cellular modem is not updated; I try to update with mfw_nrf9160_1.0.1.zip Now my application is alive: The status of LTE Link Monitor is fine (all annunciators are green and Netwwork info is filled correctly) LED3 ON LED4 Blinking NRF_CLOUD_EVT_USER_ASSOCIATION_REQUEST Please enter the user association pattern using the buttons and switches I try the magic sequence; I get: NRF_CLOUD_EVT_USER_ASSOCIATION_REQUESTAT+CESQ+CESQ: 99,99,255,255,255,32 At this point I try to update the certificates. For some time the modem appeared unable to connect; maybe a coincidence, after reflashing from SES it is online again. Only LED 3 blinking this time. Tried the connect procedure on nrfclout it agains says I have an old device. The magic button/switch sequences does not work anymore. I try again the nrf9160dk_asset_tracker_09-10-2019_c9c833b1.hex file: After startup I issue the commands: AT+CFUN=4 AT%XSYSTEMMODE=0,1,0,0 AT+CFUN=0 LTE annunciator remains RED. After some time and some reboots; in the log I see: OK[00:00:16.974,365] [0m nrf_cloud_transport.nct_connect: IPv4 Address 0x692ae503[0m LTE is green Still only LED 3 is blinking. But after some time: AT+CESQ+CESQ: 99,99,255,255,255,37 OK AT+CESQ+CESQ: 99,99,255,255,255,37 OK cloud_connect failed: -111 LTE link disconnect Shutdown modem ***** Booting Zephyr OS build v1.14.99-ncs3-snapshot2-2647-gd6e67554cfeb ***** Flash regionDomainPermissions