If you have a backup, restore it via professional tools. If not, you may need a "DUMP" file from a working device. 3. Firmware Flashing (Standard Fix) Sometimes a simple software refresh can re-initialize data:
: Flashing a complete 4-file (BL, AP, CP, CSC) stock ROM via sm-g920f nv data file
: If a backup is unavailable, some technicians attempt to "rebuild" the file by manually editing the .nv_data file or flashing a "good" copy from an identical device, though this carries high risk. If you have a backup, restore it via professional tools
: This generic IMEI is a sign of corrupted NV data or a wiped EFS partition. Known Solutions for Repair If you have a backup
You should see something like nv -> /dev/block/sda9 (or similar). Note this path.