If your IMEI is showing as "null/null" or "000000," you generally have two paths to recovery. 1. Restore from a Backup (Recommended)
The EFS (Encrypted File System) folder is a critical partition in Samsung devices. For the SM-J710F model, this directory stores unique, device-specific data including: The international identity of your phone. Baseband Version: Instructions for the phone’s radio. MAC Address: Identifying info for Wi-Fi and Bluetooth. Product Code: Regional lock and update information.
Boot your phone into Download Mode (Volume Down + Home + Power). Step 3: Use Odin3 on your PC.
If you don't have a backup, you may need to find a flashable EFS reset file specific to the J710F. Download a J710F EFS flash file (.tar or .zip).
Using the wrong partition table during an Odin flash. How to Fix EFS Issues on the SM-J710F
Modifying or replacing EFS files can be risky. Flashing an EFS file from a different device can result in a "Permanent Radio Frequency" failure. Always ensure the file is specifically for the variant of the Galaxy J7. If you'd like to move forward, let me know: Does your phone currently show "null" IMEI ? Do you have Root access or a Custom Recovery installed? Which Android version is your J710F running?
Place the EFS file in the CP or AP slot (depending on the file type) and hit Start. Essential Tools for EFS Management To interact with the J710F EFS partition, you will need: Odin3: The standard flashing tool for Samsung. TWRP Recovery: Essential for creating partition images. ADB & Fastboot: For manual command-line backups.