: The .pac file being flashed does not match the hardware revision or partition layout of the device.
If the error is due to a partition layout change (common when upgrading/downgrading Android versions): Go to > Options . Check the Repartition box. spd flash tool bkf nv error
Note: This may result in a "Null IMEI" or "Invalid IMEI" after flashing, which will require manual restoration later. 2. Use the Latest Tool Version Note: This may result in a "Null IMEI"
The "BKF" in the error likely refers to , and "NV" refers to Non-Volatile data. When using the Spreadtrum Upgrade or Research Download tools, the software typically tries to back up existing NV data before overwriting it with new firmware to ensure the device maintains its unique identification (like IMEI) after the flash. Common causes include: When using the Spreadtrum Upgrade or Research Download
Navigate to the or Calibration tab (depending on the tool version).