If your G920F is still working normally, stop reading and back up your NV data immediately. Here’s how:
If you are using a JTAG box (Medusa, EasyJTAG) or a RIFF box, you need a full NV_Dump.bin file for the G920F. These are not found on public forums due to legal IMEI cloning risks.
Safe sources for certified repair professionals:
Would you like a step-by-step for any specific method, such as manual hex editing of nv_data.bin or using Odin to flash EFS only?
Samsung Galaxy S6 (SM-G920F) , the Non-Volatile (NV) data file is critical for maintaining network connectivity, as it contains calibration and security data like your baseband version
. If this data is corrupted, you will often see "IMEI Null" or "Baseband Unknown" in your device settings. Common Issues & Errors "Checking NV Data... Error"
: This frequently occurs during repair attempts with tools like Z3X Samsung Tool PRO
. It typically indicates that the security partition is damaged (Error 1). IMEI 35000000000009
: This generic IMEI is a sign of corrupted NV data or a wiped EFS partition. Known Solutions for Repair
Technicians generally use specialized service boxes to resolve these issues. Key steps from community guides include: Write NV Data from Backup
: If you have a previous backup, writing the NV file back to the device via is the most effective fix. Repair Network
: After flashing or writing new NV data, a "Repair Network" operation is usually required to restore signal. Stock Firmware Flash
: Flashing a complete 4-file (BL, AP, CP, CSC) stock ROM via
can sometimes restore a missing baseband by re-writing the modem (CP) file. Octoplus Solution
: Some users report fixing the "Reading NV data... error (1 138)" by using the "Read Code" function in Octoplus Box Recovery & Download Mode Access If you need to flash the device or wipe partitions: SAMSUNG G925F Hang On Logo Change Emmc - Facebook
NV (Non-Volatile) data file for the Samsung Galaxy S6 ( Go to product viewer dialog for this item. Go to product viewer dialog for this item.
) is a critical system component responsible for storing hardware-specific calibration data and network identification. In technical servicing, this file is primarily used to resolve network failures or restore lost (International Mobile Equipment Identity) information. Core Functions and Significance sm-g920f nv data file
The NV data on the Samsung Galaxy S6 platform (Exynos 7420 chipset) serves several essential roles: Network Identity
: It houses the device's unique IMEI number and serial identification. RF Calibration
: Stores Radio Frequency (RF) calibration parameters required for the device to connect to various cellular bands (LTE/WCDMA). Security & Encryption : Works in conjunction with the EFS (Encrypted File System) to protect sensitive identity data. Connectivity Integrity
: Corruption of this file typically results in "Emergency calls only" or "No service" errors, even if the SIM card is valid. sstic 2026 Relationship with EFS and CERT Files
In Samsung's architecture, the NV data does not operate in isolation: EFS Partition
: A secure zone that contains both the baseband and IMEI information.
: A digital certificate specifically for the IMEI. While NV data provides the raw identification, the CERT file validates it against Samsung’s security protocols. Dependency : To effectively repair a damaged network or IMEI on the
, technicians often require both a valid NV backup and a matching CERT file Technical Repair Operations
Servicing the NV data usually requires professional GSM tools like the Z3X Samsung Tool Pro Octoplus Box Prerequisites : The device must be
to allow software access to protected partitions like EFS and NV.
: It is a standard safety procedure to read and save a security backup (
or similar format) before attempting any writes to the NV data. Restoration
: Writing a clean NV data file can fix "Baseband Unknown" issues or restore the phone's ability to recognize the network after a botched software update. for a specific network issue on the How to not break LTE crypto - Sstic 2 Jun 2016 —
SM-G920F NV data file (Non-Volatile data) is a critical system file for the Samsung Galaxy S6. It contains unique device information required for network connectivity and hardware identification. What is NV Data?
NV data stores "Non-Volatile" parameters that persist even after a factory reset or firmware update. For the SM-G920F, this includes: IMEI Number
: Your device's unique identification for cellular networks. Baseband Information : Controls the modem and radio functions. Calibration Data : Settings for Wi-Fi, Bluetooth, and GPS sensors. Product Code & Serial Number : Regional and manufacturing identifiers. When do you need this file? You typically search for an NV data file (or an EFS backup If your G920F is still working normally, stop
) if your device is experiencing the following issues after rooting or flashing custom ROMs: Unknown Baseband : The phone cannot "see" its own modem software. Null/Invalid IMEI
: The phone shows "IMEI: null" or a generic number (0049...), preventing calls and data. No Service : The device cannot register on any mobile carrier. Important Technical Warning NV data is device-specific.
Using an NV data file or EFS backup from a different SM-G920F unit can cause permanent issues, such as a mismatched IMEI or "Phone not allowed" errors on cellular networks.
If you are trying to repair your device, it is recommended to: Restore your own backup
: Always use a backup made from your specific device via TWRP or specialized Samsung repair tools (like Z3X or Octoplus). Flash Stock Firmware
: Sometimes reflashing the official 4-file (BL, AP, CP, CSC) firmware via Odin can re-initialize corrupted partition headers. Are you currently facing a "No Service" issue, or are you looking for a on how to back up these files?
The file size was exactly 32,768 bytes. Just a scrap of binary code in the grand scheme of the internet, yet in the dimly lit back-alley repair shop in Taipei, it was worth more than its weight in gold.
The shop owner, a man known only as "Jinx," stared at the hexadecimal editor on his monitor. The text on the screen glowed a dull green.
SM-G920F_NV_DATA.bin
To the uninitiated, the filename meant nothing. To Jinx, it was the fingerprint of a ghost.
The Samsung Galaxy S6 (model SM-G920F) had been a revolutionary device in its time—glass and metal, a sleek predator of 2015. But this specific unit, the one sitting dead on the anti-static mat in front of him, was a liability.
An hour ago, a nervous kid in a hoodie had dropped it off. The screen was shattered, but that wasn’t the problem. The phone wouldn’t even boot past the Samsung logo. It didn't have a "Network Locked" message; it simply had no IMEI. The baseband was unknown. It was, for all cellular purposes, a brick.
"My life is on there," the kid had whispered, his hands shaking. "I don't care about the contacts. I need the second factor. The authenticator. If I don't get in, they're going to know I took it."
Jinx hadn’t asked who "they" were. In this business, ignorance was a survival trait. But he knew the diagnosis immediately: Corrupted NV Data.
The NV (Non-Volatile) data file is the soul of a phone. It contains the calibration data for the radio, the MAC addresses for Wi-Fi and Bluetooth, and most importantly, the IMEI—the phone’s social security number. When that file gets corrupted, the phone loses its identity. It ceases to exist to the cell towers.
Jinx cracked his knuckles. This wasn't a hardware fix. No amount of soldering or heat-gunning would bring back data that had dissolved into digital noise. He needed a transplant. He needed a donor. Would you like a step-by-step for any specific
He spun his chair around to the wall of "The Morgue"—a shelving unit lined with hundreds of motherboards, their green circuits exposed like dissected frogs. He needed a backup, a clean NV file for an SM-G920F.
Technically, he could just write a generic certificate. The internet was full of "Universal S6 NV Files." But Jinx was an artist. A generic file would throw a security mismatch flag if the phone’s bootloader was newer than Android 6.0. And the original security software was Samsung Knox—merciless. If the security triangle didn't match, the phone would self-destruct in a boot loop.
He scrolled through a private server he maintained, a graveyard of backups from devices long since recycled.
Then he saw it. An old file, dated three years ago. It had been pulled from a "write-off" unit—a phone that had been crushed but whose logic board had survived.
Jinx loaded his JTAG box. The interface was archaic, a relic of the Android 5.0 era, but it spoke the language the phone needed to hear.
"
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.
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
Even on official firmware.
Several Android repair communities share NV Data dumps. The most reliable sources include:
Important warning: Many free NV files online contain malware. Never run executable files from unknown sources. Only download .bin or .tar files containing the NV partition.
The SM-G920F is the model number for the Samsung Galaxy S6 (international Exynos variant). “NV data” (non-volatile data) refers to device-specific calibration, configuration, and network-related parameters stored in persistent flash (often called NV, EFS, or NVRAM depending on device/firmware). The NV data file for SM-G920F typically contains IMEI/serial info, radio calibration (baseband), Wi‑Fi/Bluetooth MACs, network provisioning, and other hardware/configuration keys essential for proper cellular and wireless operation.
If you have another working SM-G920F (same region/firmware), you can extract a generic NV and then manually write only your IMEI.