You need root access (via TWRP recovery). If your J7 isn't rooted, do this immediately.
If you want, I can provide step‑by‑step Odin flashing instructions for SM-J710F, commands to back up /efs with root/TWRP, or recommend exact firmware and driver links if you tell me your region (or allow a suggestion).
Sample Text:
The "j710f efs file" seems to refer to a specific file related to the Samsung Galaxy J7 (2016) model, specifically an EFS (Engineering File System) file. EFS files are crucial for device calibration, including radio and other hardware configurations. If you're dealing with a "j710f efs file," you're likely looking into the technical aspects of your device, perhaps needing to backup, restore, or modify it for troubleshooting or customization purposes.
Some custom ROMs for J710F use outdated vendor blobs that override EFS permissions. Always backup before switching ROMs. j710f efs file
Most users ignore EFS backup until disaster strikes. By then, it’s often too late. Follow these methods to safely backup your EFS partition on SM-J710F.
| Myth | Truth |
|------|-------|
| "A custom ROM fixes null IMEI" | No – custom ROMs don't touch EFS. You need to restore EFS first. |
| "You can manually edit IMEI with a hex editor" | Not on Exynos 7870. The partition is signed and encrypted. Editing = checksum fail → still null. |
| "Dirty flashing stock firmware restores EFS" | Only if partition structure is intact. If overwritten, it's gone. |
| "Factory reset from recovery erases EFS" | No. Factory reset wipes /data, not EFS. That's why resetting doesn't fix IMEI issues. | You need root access (via TWRP recovery)
Dial these codes in the phone app:
*#06# → Should show two IMEIs, both 15 digits, not "0" or "null"
*#0011# → Service mode. If blank or error, modem/EFS issue
*#0808# → Set to RMNET+DM+MODEM (for repairs)
Or in Settings → About Phone → Status – look for IMEI information. If you see "Unknown" or "000000000000000", your EFS is corrupted. Or in Settings → About Phone → Status
Typical EFS recovery steps for J710F: