2021 — -huawei Firmware E173 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.

: HSDPA services up to 7.2 Mbps and HSUPA services up to 5.76 Mbps . -huawei firmware E173 11.126.85.00.209 B427-

, allowing the modem to be used beyond simple web browsing. It is a favorite for: SMS Gateways: Using the modem to send/receive automated alerts. IoT Prototypes: Connecting Raspberry Pi or Arduino units to the internet. Voice Features: The SIM card tray contacts are dirty, or

After installing , you gain access to a hidden engineering menu. use the AT command AT^SYSCONFIG=2