This manual is intended only for people that have no IMEI. If your IMEI 40000 looks like 00000 or contact me and do not make the manual!
Efs.img file for Samsung I9100 Galaxy S II backuped by gsm-developers Users. Model Number: Samsung I9100 Galaxy S II. Use: Odin Software Samsung Flasher V3.10 in [Pda Section] Description: This is a backup file taked by forum’s users and has been tested. Flash the file in the pda section in the odin software. THose instructions are for a completely different model of phone, the Skyrocket and T989, and are not compatible with the GT-i9100. Restore your nandroid backup, assuming you have one. Reflash your ROM again. Not a good idea to tinker with the efs file as a rule.
You must have root and installed terminal emulator - TE First check whether your EFS is correct. Point 1: TE Run and type: mount looking for this line /dev/block/mmcblk0p1 on /efs type ext4(rw,nosuid,nodev,noatime,commit=20,barrier=1, nodelalloc,data=ordered) Point 2: Run a terminal emulator and type these commands: su confirm and then type mke2fs /dev/block/mmcblk0p1 confirm and then type mount -w -t ext4 /dev/block/mmcblk0p1 /efs confirm and then type reboot Point 3: Download this file. Unzip it and copy ilostit.dd to phone memory. Su confirm and then type dd if=/sdcard/ilostit.dd of=/dev/block/mmcblk0p1 confirm and then type reboot.