(Backup NV) error in the Spreadtrum (SPD) Flash Tool typically occurs because the tool is trying to back up or write to the device's Non-Volatile (NV) memory—which contains critical calibration and IMEI data—and failing due to a mismatch or corrupted partition. Common Fixes Disable NV Backup SPD Upgrade or Research Download Tool (gear icon) >
If the device’s NV partition is physically damaged or logically corrupted, the tool cannot create a backup. Mismatched Firmware: spd flash tool bkf nv error