J710f Efs File |work|

Before you attempt to flash a custom ROM, root your device, or modify the system files on your Samsung J7 (2016), backing up your EFS folder should be your absolute first step.

Necessary for the modem to communicate with the OS. j710f efs file

Corrupt EFS often results in "Unknown Baseband," meaning the modem cannot communicate with the SIM card. Before you attempt to flash a custom ROM,

EFS data is fragile and can be damaged by common actions: root your device