IMEI Kit+Reviver Free(N7100)

This is a tool to revive your phone from an expensive piece of plastic to a working phone. With this app, you can easily get your phone out from permanent safe mode in a single click. Permanent mode occurs on deleting your EFS. Once you get into Permanent safe mode, it's bit difficult to fix the problem and get your phone in working condition. Usually this problem is fixed by providing command in terminal and flashing fixes via recovery. So this is when this app comes handy to ease the process,
Along with fixing the safe mode, this app also gives you ability to easily backup and restore your EFS(IMEI). You can easily backup and restore your EFS in a single click. Please note that tinkering with EFS is risky.
App has user friendly UI, meaning there are some safety measures implemented to prevent accident clicks. On clicking 'Restore', it asks for confirmation without directly restoring it since touching EFS anyway is dangerous.
Note that backups are stored in "sdcard/manny_efs_backup" folder. App will backup EFS in two different formats, one is ".img" and second is ".tar.gz". This is to be double sure that EFS backup taken is safe.
Free version lacks fixing Permanent Safe Mode. Upgrade to Pro version to get it.