Sm-g920f Nv Data File -

If you’re troubleshooting an SM-G920F and see any of the following, suspect NV damage:

| Symptom | What you see | |---------|---------------| | No IMEI | *#06# returns “IMEI: Null / Unknown” | | Baseband unknown | Settings → About Phone → Baseband version: Unknown | | No service | Signal bar shows an empty triangle or circle with a slash | | Wi-Fi MAC changes on reboot | MAC address resets to 02:00:00:00:00:00 each boot | | Failed authentication | “Not registered on network” even with correct SIM |

Also, in Download Mode, a corrupted EFS often triggers:

WARRANTY VOID : 1 (0x0300)
CURRENT BIN : Samsung Official
SYSTEM STATUS : Custom sm-g920f nv data file

Even on official firmware.

Stock firmware does not contain your unique NV data, but flashing the full factory binary (a special engineering firmware) can sometimes rebuild a minimal NV structure. Look for "COMBINATION" firmware for the SM-G920F. After flashing combination firmware, the phone may generate a new, albeit empty, NV Data file.

Before you start downloading random files from forum links, it is crucial to understand what "NV Data" actually means. If you’re troubleshooting an SM-G920F and see any

NV stands for Non-Volatile. Unlike RAM (which clears when the power is off), NV memory retains data even when the battery is removed. On your Samsung SM-G920F, the NV Data partition stores the unique, device-specific configuration of the modem and radio hardware.

Via TWRP:

Via root:

dd if=/sdcard/efs_backup.img of=/dev/block/platform/15570000.ufs/by-name/EFS

How do you know if you need an NV data file? Look for these specific symptoms:

| Symptom | What you see on the screen | | :--- | :--- | | Null IMEI | Dial *#06#. It shows "Null" or "Blank" instead of a 15-digit number. | | Unknown Baseband | Go to Settings > About Phone > Status. Baseband version shows "Unknown." | | No Signal / Emergency Calls Only | The signal icon shows an empty triangle or a circle with a line. | | Invalid SIM Card | Even with a working SIM, the phone rejects it. | | Wi-Fi and Bluetooth MAC addresses change on every reboot | A clear sign of NV corruption. | | Phone restarts when trying to access network settings | Severe corruption causing modem crashes. |

If you experience any of these after flashing firmware or trying to root, your NV Data file is almost certainly corrupt or missing. WARRANTY VOID : 1 (0x0300) CURRENT BIN :

/efs/nv_data.bin          # main NV binary
/efs/nv_data.bin.md5      # integrity check
/efs/imei/                 # IMEI backup
/efs/bluetooth/            # BT MAC
/efs/wifi/                 # WiFi MAC
/efs/factory.prop          # factory mode flags
/efs/cryptoprop           # encryption related