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[ How to fix ] E:failed to mount /efs (Invalid argument) in recovery mode EFS Download ADB tool & ADB Drivers http://adf.ly/1PWcEO How to run it ? open a notepad text file, type CMD.EXE inside it & save it as RUNME.BAT to this location C:\adb now go to that folder C:\adb & double click the RUNME.BAT file if you don't have root,but have a custom recovery, just download & copy this zip to your internal phone memory & install it via the recovery then reboot : http://adf.ly/1Q6NMi adb shell su cd /dev/block/platform cd dw_mmc cd by-name ll mke2fs /dev/block/..... mount -w -t ext4 /dev/block/..... reboot Donate via PayPal - Secure https://www.paypal.com/us/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=FBWZUE4CQU62Y more info & steps : http://www.selftechgenius.com/how-to-geek-2/how-to-fix-e-failed-to-mount-efs-invalid-argument-in-all-samsung-galaxy-phones/ http://zidroid.com/how-to-fix-failed-to-mount-efs-for-galaxy-s3-gt-i9300/
