If your device shows an "Unknown Baseband," "Invalid IMEI," or "No Service" error, you likely need to restore your NV data. This article provides a comprehensive guide on finding the Samsung G925T NV data file download and how to use it to revive your phone. Understanding NV Data and the EFS Partition

Before you attempt to flash any NV data files, ensure you have the following:

Root Access: Most methods for writing to the EFS partition require the device to be rooted.

Method 2: Using Professional Repair Tools (Z3X / Octopus)This is the most reliable method for fixing "No Service" issues.

Select "Restore" and choose the EFS/NV partition, or use the "Install" menu if it is a flashable zip. Reboot the device.