In the context of the Samsung Galaxy S6 (SM-G920F) NV (Non-Volatile) data file
refers to critical configuration data stored in the device's permanent memory. Below is a technical summary regarding its function and the common repair procedures associated with it. Overview of SM-G920F NV Data
The NV data file is a critical component that stores hardware-specific calibration data and network parameters. In Samsung devices like the , this data is typically housed within the EFS (Encrypted File System) partition. Key Functions : Stores the device's unique IMEI number
, Baseband version, serial number, and network calibration settings. Storage Medium
: Unlike older models using eMMC, the Galaxy S6 series utilizes UFS 2.0 FBGA95 memory chips. Criticality
: Corruption or loss of NV data usually results in "IMEI Null," "Unknown Baseband," or "Not Registered on Network" errors. Common Technical Issues Security Damage Error (1)
: Often occurs during firmware flashes or root attempts, indicating a failure to write to the NV data partition. Corrupted IMEI (350000...)
: A generic IMEI value that appears when the original NV data is wiped or inaccessible. NV Data Write Error
: A specific failure log seen in professional repair tools (like ) when attempting to restore network functionality. Repair and Restoration Procedures
Technical recovery typically requires professional-grade service tools and specific firmware files: NV Data Write/Repair : Tools like are used to "Write NV Data" using backup files (often in formats) to restore original network certificates. Patch Certificate
: After repairing the IMEI or NV data, a "Patch Certificate" operation is often required to allow the device to register on cellular networks. Odin Flashing : For software-level corruption, technicians use
to flash the correct PDA and CSC versions, though this rarely fixes hardware-level NV data loss without a dedicated backup. Chip-Off Recovery
: In cases of severe hardware failure, the UFS chip is physically removed and read using a J-Tech or DediProg reader to extract raw partition data. Samsung Galaxy S6 G920F | Samsung Business Saudi Arabia Samsung Galaxy S6 G920F | Samsung Business Saudi Arabia. samsung.com
Understanding and Using the SM-G920F NV Data File If you have ever found yourself staring at a Samsung Galaxy S6 (SM-G920F) with a "No Service" icon, an "Invalid IMEI," or the dreaded "Emergency Calls Only" message after a custom ROM flash, you have likely encountered an issue with your NV data.
The NV (Non-Volatile) data file is one of the most critical components of your phone’s software ecosystem. In this guide, we will break down what it is, why it gets corrupted, and how to handle it. What is the SM-G920F NV Data File?
NV data refers to Non-Volatile memory stored in the EFS (Encrypted File System) partition of your Samsung device. Unlike standard system files, this data remains intact even when you perform a factory reset.
For the SM-G920F (the international variant of the Galaxy S6), the NV data file contains: IMEI Number: The unique identity of your hardware.
Baseband Version: Calibration settings for your cellular radio.
Network Locks: Information regarding carrier branding or locks.
WiFi/Bluetooth MAC Addresses: Unique hardware identifiers for local connectivity. Common Symptoms of NV Data Corruption
How do you know if your NV data is damaged? Look for these red flags:
IMEI shows as "0000..." or "Unknown": Check this by dialing *#06#. sm-g920f nv data file
Baseband Unknown: Found in Settings > About Phone > Software Information.
No Network Signal: The phone detects the SIM card but cannot register on a network.
Factory Mode Overlay: A transparent black box with yellow text appears on your home screen. Why Does This Happen? On the SM-G920F, NV data issues usually stem from:
Interrupted Firmware Flashes: If Odin fails during a hidden.img or modem.bin write.
Downgrading Android Versions: Moving from a higher security patch to an older one can "trip" the EFS partition.
Rooting and Custom ROMs: Incorrectly formatted partitions during a TWRP wipe can accidentally erase the EFS/NV data. How to Fix SM-G920F NV Data Issues 1. The Proactive Approach: Backup
Before you experiment with software, always back up your EFS partition. Using TWRP: Go to Backup and select only the EFS partition.
Using Apps: If rooted, apps like "Partitions Backup & Restore" can save your NV data as a .img or .tar file. 2. Restoring NV Data via Professional Tools
If the damage is already done, standard Odin flashing rarely fixes corrupted NV data because Odin typically skips the EFS partition to protect user identity. You may need:
Combination Firmware: This is "factory testing" firmware used by Samsung engineers. Flashing a G920F combination file can often reset the radio parameters and allow the phone to communicate with the hardware again.
Z3X or Chimera Tool: These are professional-grade service tools. They can "Repair" or "Write" NV data files (often in .nv or .bin format) to the device to restore the IMEI and network functionality. 3. Using a "Donated" NV Data File
Technicians often use a "clean" NV data file from a working SM-G920F to jumpstart a dead radio.
Warning: Writing another phone's NV data will often change your IMEI to match the donor phone. In many regions, this is legally grey or restricted. Always try to restore your original backup first. Conclusion
The SM-G920F NV data file is the digital "soul" of your Galaxy S6's modem. Without it, your smartphone is essentially a small tablet without cellular capabilities. If you are planning to flash custom software, always secure an EFS backup first. If you are already facing a "No Service" issue, look toward Combination Firmware or professional service boxes as your primary path to recovery.
Are you currently seeing an "Unknown Baseband" error, or is your IMEI showing up as null/zeros?
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. In the context of the Samsung Galaxy S6
"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.
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.
SM-G920F_Stock_Backup_01.bin — Error: Checksum mismatch.G920F_Cert_Pack.tar — Risky. High chance of null IMEI.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.
"
The SM-G920F (Samsung Galaxy S6) NV data file is a critical partition containing the device's Non-Volatile information, such as IMEI, baseband, and network calibration data. When this file is corrupted or missing—often after a bad firmware flash—it leads to the "long story" of a phone that won't connect to a network or shows "IMEI Unknown". Why NV Data Fails
The corruption typically occurs during aggressive software modifications:
Failed Flashing: Interruptions or using incorrect firmware for the G920F variant.
Security Lock Conflicts: Attempting to bypass FRP (Factory Reset Protection) or privacy locks can sometimes damage the NV data partition.
Baseband Corruption: If the EFS or SEC partitions are wiped, the phone loses its "identity," leaving the user with a device that is essentially a high-end paperweight. Recovery and Repair
Fixing NV data issues usually requires specialized repair tools and a "Full Firmware" package that includes specific security and network fix files:
Backup/Restore EFS: Professionals recommend backing up the EFS/NVdata partition before any flashing.
Repair Firmware: Using a "4-file" (BL, AP, CP, CSC) or "5-file" repair firmware can often re-initialize these partitions.
Specialized Tools: Services like the HalabTech Support or AZROM Repair Files provide specific DUMP, CERT, and NVdata files to manually restore the network configuration.
Are you currently facing a "No Service" error or an invalid IMEI after a software update?
You're looking for an article on the "SM-G920F NV Data File". I'll provide you with some information on this topic. The Samsung Galaxy S6 (model SM-G920F) had been
What is an NV Data File?
An NV (Non-Volatile) data file is a type of file used in mobile devices, including Samsung smartphones. It's a binary file that stores configuration data, such as device settings, calibration data, and other information that's retained even when the device is powered off.
What is SM-G920F?
SM-G920F is the model number for the Samsung Galaxy S6, a flagship smartphone released in 2015. The "SM" prefix is a standard code used by Samsung to identify its mobile devices.
What is the SM-G920F NV Data File used for?
The SM-G920F NV data file is specific to the Samsung Galaxy S6 (SM-G920F) and contains configuration data that's used by the device. This file may include information such as:
Why is the SM-G920F NV Data File important?
The SM-G920F NV data file plays a crucial role in ensuring that the Samsung Galaxy S6 functions properly. If the file is corrupted or deleted, it can cause issues with device functionality, such as:
How to fix issues related to the SM-G920F NV Data File?
If you're experiencing issues related to the SM-G920F NV data file, here are some possible solutions:
Conclusion
The SM-G920F NV data file is a critical component of the Samsung Galaxy S6, storing configuration data that's essential for device functionality. If you're experiencing issues related to this file, it's essential to take prompt action to repair or restore it to prevent device malfunction.
Every phone has a unique IMEI number. An NV data file from another phone contains that other phone's IMEI.
EFS.tar file on your PC or cloud storage.The Galaxy S6 marked Samsung’s shift to a fully integrated Exynos 7420 with a separate Shannon modem. While powerful, this setup introduced a notorious weakness:
EFS Partition Fragility – The EFS partition on the G920F is easily corrupted by:
CP (modem) or CSC file from a different model (e.g., G920F vs G920FD)./dev/block.No Redundancy – Unlike newer Samsung devices that mirror NV data, the G920F stores critical parameters in a single location. One bad write = permanent damage without a backup.
Common Repair Scenarios – Many G920F units reach repair shops with:
null or 350000000000000.In almost every case, the NV Data file is either erased, zeroed out, or filled with garbage data.
On the SM-G920F, NV data resides in the EFS partition (/dev/block/sda5 or similar, depending on the firmware revision). When backed up via tools like TWRP or Octoplus, the resulting file is typically named:
efs.img (full partition image)NV_data.bin (extracted modem NV items)Inside, the file is structured as a series of NV items – indexed parameters (e.g., NV item 550 is the primary IMEI, NV item 851 is the Bluetooth address). Each item has a header, length, and raw data.
Using a hex editor or specialized tools like Revival or NS Pro, one can manually edit NV items—but this is risky. One wrong checksum, and the modem rejects the entire file.
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.
| Myth | Fact |
|-------|------|
| Flashing stock ROM restores IMEI | No – stock ROM never touches EFS unless you use CSC (not HOME_CSC). |
| You can generate IMEI from serial | No – IMEI is independent, stored only in NV + printed on box. |
| Zero IMEI = hardware damage | Not always – often just corrupt NV data. |
| Any QCN file works | No – Exynos doesn’t use QCN, only .nv_data.bin. |