Re: Debugging "SIM Not Inserted PIN Required" issue

Hello again,

Has anyone encountered a similar issue or have any insights on potential debugging approaches? Any guidance would be greatly appreciated.

Looking forward to your thoughts.

Best regards,
Sam

On Thu, Mar 6, 2025 at 1:28 PM Samuel Jayden <samueljaydan1994@gmail.com> wrote:

Hello OpenBSD,

I am experiencing a peculiar issue with a device in which I use a Sierra Wireless EM7455(*) LTE module that I have converted to MBIM mode. I have also disabled umsm by entering config -e -f /bsd.

Most of the time, the umb status on my device appears as "SIM not inserted PIN required," even though a SIM card is physically inserted. The only scenario in which I achieve success is after rebooting the device. However, rebooting is not a guaranteed solution—sometimes, it takes 4-5 consecutive reboots before umb0 becomes functional.

How can I debug this issue?

For further context, I have also swapped out the LTE module with another unit, yet I observe the same behavior across 5-6 different devices of the same make and model.

P.S. The device has a single LTE module but dual SIM slots.

(*)
addr 03: 1199:9071 Sierra Wireless, Incorporated, Sierra Wireless EM7455 Qualcomm Snapdragon X7 LTE-A super speed, power 126 mA, config 1, rev 0.06, iSerial LF10770712011033 driver: umb0 driver: ugen0

Also dmesg is attached via this email.

Thanks in advance.