It is 99% likely to be a scam or malware. Free NV files are often corrupted on purpose to ruin your phone further. Always use professional tools to generate a new NV based on your device.

Always use a tool like the Samsung Tool Pro or Octoplus to back up your existing EFS/NV data before attempting any write operations.

Fixing a "Baseband Unknown" error after a failed custom ROM flash or firmware downgrade. How to Write/Restore NV Data

Z3X Samsung Tool Pro, Octopus Box, or Chimera Tool are the industry standards.

If this data becomes corrupt—often after a bad firmware flash or incorrect rooting—the phone will fail to register on the network.

The NV (Non-Volatile) data, often stored in the EFS partition on Samsung devices, contains: : The unique identifier for your device.

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