Navigate to the or Calibration tab (depending on the tool version).
: The existing NV data on the device is damaged ("NV data in device is crashed"). spd flash tool bkf nv error
: The tool detects a mismatch in calibration data and stops the process to prevent a permanent "Invalid IMEI" or "No Service" issue. Step-by-Step Solutions to Fix BKF NV Error 1. Disable NV Calibration Backup (Most Common Fix) Navigate to the or Calibration tab (depending on
The (often appearing as _BKF_NV_W Failed ) is a common hurdle when flashing Spreadtrum/Unisoc-powered devices. This error indicates a failure during the backup or write process of the Non-Volatile (NV) data partitions, which store critical device-specific information like IMEI, baseband details, and calibration data. Understanding the BKF NV Error Step-by-Step Solutions to Fix BKF NV Error 1
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