If you are a technician using professional boxes (Z3X, Octoplus), you will encounter these specific file types:
stands for Non-Volatile . The NV Data file is a hidden partition on your phone’s chipset (usually the Qualcomm or Exynos processor) that stores critical device-specific configuration data. Unlike the operating system (Android), the NV Data does not reset when you perform a factory reset. sm-g920t nv data file
: Data that helps the phone connect to T-Mobile’s specific LTE and 4G bands. If you are a technician using professional boxes
The software can no longer communicate with the modem hardware. : Data that helps the phone connect to
: NV files are stored in the EFS (Encrypting File System) partition. They act as a permanent memory for calibration data that must persist even after a factory reset or firmware flash.
Modifying or repairing an IMEI is subject to local laws. Always ensure you are restoring the original IMEI found on the back of your device or its original box.
, or are you looking to perform a before modifying the phone's software?