Disconnecting the USB cable while flashing firmware via Odin.
Copy your TWRP backup folder (containing the efs or nvdata image) to your phone's internal storage or an On-The-Go (OTG) USB drive. Power off your SM-G920F completely.
: Security researchers might examine specific files and data storage mechanisms to identify vulnerabilities. Understanding how data is managed on a device can help in discovering potential security risks and developing patches or fixes.
The International Mobile Equipment Identity that authenticates your phone on cellular networks. sm-g920f nv data file
Reflash a clean, official multi-file Stock Firmware (BL, AP, CP, CSC) via Odin right after to rebuild the structural partitions.
⚠️ : The following solutions are intended for educational and service purposes. Tampering with your phone's IMEI to change it to a non-original number is illegal in many jurisdictions. These methods should be used only to restore the phone's own, legally assigned IMEI.
Using outdated root scripts or tools that inadvertently overwrite security sectors. Disconnecting the USB cable while flashing firmware via Odin
When your SM-G920F NV data is damaged, your phone loses its ability to connect to cellular networks, shows an "Unknown Baseband" status, or displays a generic "00000000000000" or null IMEI.
| 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 . |
Knowing your would also help me narrow down the specific firmware files you need. Share public link : Security researchers might examine specific files and
The Samsung Galaxy S6 (model SM-G920F) remains a classic device in the Android modding and repair community. However, like many Samsung devices, it is susceptible to critical software corruptions involving its cellular connectivity. If your device displays errors like "Not Registered on Network," a generic IMEI (such as 0049... ), or a complete lack of signal after flashing a firmware file, the root cause is almost always a corrupted NV (Non-Volatile) data sector.
NV data stores "Non-Volatile" parameters that persist even after a factory reset or firmware update. For the SM-G920F, this includes: IMEI Number
: Many NV repair methods, such as a factory reset or flashing certain firmwares, can result in the loss of all user data.
When this file is corrupted, the system cannot read the radio data, resulting in loss of network services, inability to make calls, and "No Service" errors. Causes of NV Data Corruption
These tools allow you to "Read QCN" or "Read EFS," which can be used to restore the NV data later if the phone becomes corrupted.