Which of the SPD Flash Tool are you currently using?
By following the steps in this guide, you will be well-equipped to diagnose the cause, implement a fix, and successfully flash your SPD- or Unisoc-based device.
Click the button (the gear icon) and select your phone's firmware file ( .pac file). Click the Settings icon (it looks like two gears). Look for a tab at the top named Calibration . spd flash tool bkf nv error
The version of the you are currently running.
If skipping the backup does not work, the existing NV partition on the device might be heavily corrupted, preventing the tool from writing new data. Open the flash tool settings (Two Gears icon). Which of the SPD Flash Tool are you currently using
Since the error usually triggers during the backup phase, telling the tool to skip this step allows the firmware to flash completely. Open the or Upgrade Tool .
Click the (Load Packet) on the top left and select your firmware .pac file. Wait for it to load completely. Click the Two Gears icon (Settings/Settings Configuration). Navigate to the Backup tab in the pop-up window. Click the Settings icon (it looks like two gears)
If you are trying to flash a firmware file meant for a different hardware variant of your device, the NV calibration parameters will fail validation.