A failed update or a power cut during a flash process can render a dongle useless ("bricked"). Users often search for the original stock firmware to revive the device.
Almost all Ufi dongles use generic chipsets (Spreadtrum SC7731, Unisoc UIS8310, or Qualcomm MDM9x07). The firmware is freely shared by OEM factories in China. Paying for it is a scam. This guide focuses on : 4g Ufi Dongle Firmware -FREE-