No internet with a SIMFAILURE error message - No-internet-with-a-SIMFAILURE-error-message/No-internet-with-a-SIMFAILURE-error-message

• No internet connection
• WAN connection doesn't come up
• Router logs show:

05:01:33 PM INFO cp_stack_mgr int1: Error SIM Failure.
05:01:33 PM INFO cp_stack_mgr int1: SIM returned the following status: SIMFAILURE.
05:01:33 PM INFO cp_stack_mgr int1: LTE Modem preconfiguration failed - status:25
05:01:33 PM INFO WAN:d27c06 Preconfigured Event: user intervention required

05:01:46 PM WARN WAN:d27c06 SIM error: SIMFAILURE

• Support log lists Initialized in the WAN configuration snippet:

        'wan': {
            'devices': {
                '0': {
                    'id': 'mdm-d27c06',
                    'auto_apn': {
                        'state': 'Initial',
                        'index': 0,
                        'plmn': 'Unknown',
                        'mode': 'Normal',
                        'iccid': ''
                    }
                }
            }
        }

• SIM works in another modem
• Router NCOS is up to date
• Modem firmware is up to date

Even though the modem is running the latest modem firmware version, it did not finish loading it (state is Initial). Manually reloading firmware forces it to do so (state becomes Finished).

1. Re-upload modem firmware: NCOS: Manual Modem Firmware Update