Attempting to downgrade from Android 8.1.0 (Oreo) to Android 7.0 (Nougat) or 6.0.1 (Marshmallow) without updating the modem files frequently breaks the EFS structure. Symptoms of a Corrupted EFS Partition
model, is a critical partition that stores device-specific identification data. If this partition is corrupted, your phone may lose its network capabilities, show an "Invalid IMEI," or get stuck in a "Baseband Unknown" state. What is the J710F EFS File? j710f efs file
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? Attempting to downgrade from Android 8
Swipe to backup. This creates a restorable image of your unique data. 3. How to Restore or Repair EFS What is the J710F EFS File
On your Samsung J710F, the isn't a single file you can tap on. It's a hidden partition (like a secret vault on your phone's eMMC chip) containing critical, device-unique files.
