Attempt to flash your firmware file again using the default settings. Solution 3: Verify and Re-Download the Firmware (.pac) File
You can try to flash the NV data as a separate file after the system is working.
The error message _BKF_NV_* is not a single error but a family of failures that occur during the "Backup Non-Volatile" memory phase of the flashing process. The asterisk (*) acts as a wildcard, representing various NV data types like LTE, W (Wi-Fi), or TD (TD-SCDMA). You might see variations like: spd flash tool bkf nv error
The key takeaway is to always and ensure you are using the right tools and drivers. With this knowledge, you can confidently flash your Spreadtrum or Unisoc device and recover it from even the most stubborn "bricked" states.
This will wipe all existing data and rebuild the partition structure, which often resolves "Incompatible Partition" errors associated with BKF_NV. Quick Checklist for Success : Verify that Spreadtrum/SPD Drivers are correctly installed in your Windows Device Manager. Attempt to flash your firmware file again using
When SP Flash Tool sees a mismatch — wrong partition size, corrupted backup file, or region that already has data but expects being empty — it throws a .
the checkboxes next to these specific items. This prevents the tool from trying to read or backup the corrupted NV partitions. Click OK to save the changes. The asterisk (*) acts as a wildcard, representing
The error may stem from a corrupted or incompatible firmware file.
Use the tool to rewrite the original IMEI numbers back to the newly created NV partition. Conclusion