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[ How to fix ] E:failed to mount /efs (Invalid argument) in recovery mode EFS

Download ADB tool & ADB Drivers

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 :

adb shell
su
cd /dev/block/platform
cd dw_mmc
cd by-name
ll

mke2fs /dev/block/…..
mount -w -t ext4 /dev/block/…..
reboot

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41 Replies to “[ How to fix ] [ recovery mode ] E:failed to mount /efs (Invalid argument)”

  1. my Samsung tablet won't boot into recovery mode just keeps booting me into an android reinstall and shows me the failed to mount efs error pls help

  2. C:adb>CMD.EXE Microsoft Windows [Version 6.1.7601] Copyright (c) 2009 Microsoft Corporation. All rights reserved. C:adb>adb devices List of devices attached 255cee37 recovery C:adb>adb shell ~ # ?[6ncd /dev/block/platform cd /dev/block/platform /dev/block/platform # ?[6ncd dw_mmc cd dw_mmc /sbin/sh: cd: can't cd to dw_mmc /dev/block/platform # ?[6ncd by-name cd by-name /sbin/sh: cd: can't cd to by-name /dev/block/platform # ?[6nll ll /sbin/sh: ll: not found /dev/block/platform # ?[6nmke2fs /dev/block/….. mke2fs /dev/block/….. mke2fs 1.42.9 (28-Dec-2013) Could not stat /dev/block/….. — No such file or directory The device apparently does not exist; did you specify it correctly? /dev/block/platform # ?[6nmount -w -t ext4 /dev/block/….. mount -w -t ext4 /dev/block/….. mount: can't find /dev/block/….. in /etc/fstab /dev/block/platform # ?[6nreboot reboot C:adb>

  3. Sir I have a Samsung S6 edge SM G925I .. and my above phone has been same problem as:- E-failed to mount / efs (invalid argument)

  4. This will delete all data if used on /system? I have a problem that I cannot mount /system partition (Invalid argument). Changing file system will delete data?

  5. Useless video IMHO. Yes, this will fix the mount error but it also makes sure that the whole EFS contents is lost for good, which is due to have some serious side effects like lost IMEI or WLAN MAC address etc. You've fixed the error message, not the symptoms!
    Also, the mount before reboot is of absolutely no use if you don't put some files in there.
    And you could use /dev/block/platform/dw_mmc/by-name/EFS directly since it's just a link to the physical device name. No need to copy/paste the physical device name. Ref: description: you won't be able to flash an unsigned zip from the stock recovery. Oh well, just too many errors and nonsense to mention.

  6. my device, xt1021 is not rooted and i have errors ("failed to mount" and invalid argument". so if i hit "su" inhe adb shell, the answer is "su not known". how can i root it in this state to get full su permission?

  7. Hello, I have a wik ridge fab 4g that has a concern for (WIKO ridge fab 4g) but I do not know how to proceed for that.
    A solution for me please.

  8. Dear I have GT-S7582, and show error as mount '/efs' (invalid argument) ,
    So, I search your video watch , and try as you show in you video, in CMD, start , adb devices , show my devices like this..
    List of devices attached
    42037a12c6c14100 device
    pathadb>adb shell
    ~ # [6n
    So This Show ( ~ # [6n) ??
    and after
    su
    /sbin/sh: su: not found
    ~ # [6ncd /dev/block/platform
    cd /dev/block/platform
    /dev/block/platform # [6ncd dw_mmc
    cd dw_mmc
    /sbin/sh: cd: can't cd to dw_mmc
    /dev/block/platform # [6n So Help me ..pz

  9. What if you don't have a custom recovery or a root that I know of? I do have apply update from ADB available, I believe it was factory reset as an attempt to fix it as well. It was frozen on the carrier screen so I had no way to back it up. The phone owner hadn't backed it up previously either. So is there a way to apply these settings in that situation, or do I need to tell them their phone is now a paperweight?

  10. i found another alternative,, boot into download mode and then copy the product name e.g CHNEXYNOS4412 and use that name to search for the correct factory download file for your phone. and flash it with odin. thats it. CONCLUSION that error is mainly caused by incompatible firmware usually from a different region.

  11. i'm not getting the mount option on my phone. i'm getting apply update from ADB
    tried using that option. on command promp im getting Error: Closed

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