Updating the wrong firmware will brick your dongle (make it unusable). You must match the firmware to your exact model number, hardware version, and chipset .
How to update the firmware of 4G LTE Mobile Wi-Fi - MERCUSYS 4g Ufi Dongle Firmware
Here’s an interesting and critical review topic related to , focusing on a common but under-discussed issue: firmware locking, customization limits, and performance degradation . Updating the wrong firmware will brick your dongle
Remove the cap or back cover. Look for a model number (e.g., MS2131 , UFI_001 , UF896 ) and the Hardware Version (e.g., V2.0 ). 4g Ufi Dongle Firmware