-huawei Firmware E173 11.126.85.00.209 B427- -

Huawei E173 Firmware Update Guide for Version 11.126.85.00.209 B427

The SIM card tray contacts are dirty, or the firmware's SIM voltage setting is wrong (3V vs 1.8V). Fix: Clean the gold contacts with an eraser. If that fails, use the AT command AT^SYSCONFIG=2,2,3FFFFFFF,2,2 to reset the SIM interface. -huawei firmware E173 11.126.85.00.209 B427-

Alternatively, on Windows, check Device Manager → Modem → Diagnostics → "ATI" response. Huawei E173 Firmware Update Guide for Version 11