Disabling calibration may fix the flashing error but can sometimes result in a "Null IMEI" or no network signal if the NV data was already wiped. Always keep a backup of your original firmware and NVRAM if possible before performing these operations. Working with SP Flash Tool - GeeksforGeeks
If the error prevents the phone from booting or completing the flash, you can skip the NV writing process. spd flash tool bkf nv error
The BKF NV error is generally triggered by one of the following conditions: Disabling calibration may fix the flashing error but
or "NV data in device is crashed") typically occurs when the tool fails to write or backup Non-Volatile (NV) data during the flashing process. NV data is critical as it stores device-specific information like IMEI numbers , network calibration, and serial numbers. Common Causes Corrupted NV Data The BKF NV error is generally triggered by
If the device’s NV partition is physically damaged or logically corrupted, the tool cannot create a backup. Mismatched Firmware:
