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How to fix - E:failed to mount /efs (Invalid argument)

OP anukilimanoor

5th January 2015, 08:29 AM   |  #21  
Thanks Meter: 3
35 posts
Join Date:Joined: Nov 2011
Originally Posted by waldezca

At this step:

mount -w -t ext4 /dev/block/mmcblk0p3

at the end of the sentence put an space slash and efs, you have to see something like this:

mount -w -t ext4 /dev/block/mmcblk0p3 / efs --> (then push enter key, then make the last step "reboot" to reboot your phone).

Then your phone have to start normaly but in recovery mode [showing you a yellow information of the system phone]. Look at this thread


I have a T210 and I have done everything. I did the restore from 4.4.2 from SamMobile, I flashed it, then installed CMW, then follow the steps and it said it "can't find /dev/block/mmcblk0p3...". I've tried changing the -w and -t as somebody else suggested and nothing, then I tried your solution and it doesn't show any error (only "There are some filesystem-specific -o flags", is that it?) but it doesn't work either.... any ideas will be appreciated.

I'm still stuck on the Samsung logo.

Thank you so much.

PS Sorry for grammar and stuff, English is not my first language.
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13th January 2015, 11:55 PM   |  #22  
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Thumbs up Error: Device not Found
Originally Posted by awilmets

My S3-I9300 not detect in Adb. "error: device not found"

I think what may be happening is that you need to enable debugging mode. There is a really good guide for how to do it if you search for "enable usb debugging android s3" (sorry, can't link until I've made 10 posts).

Hope that helps! (Just about to start trying to recover my IMEI too)

EDIT: Ah... Two minutes after posting I tried to carry on with the guide, but also getting "error:device not found" when trying to access the adb shell after >mount/system. I guess this can't be done out of cwm recovery mode? Thanks!
Last edited by dansar324; 13th January 2015 at 11:59 PM.
20th January 2015, 03:47 AM   |  #23  
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Join Date:Joined: Jan 2015
Help with rooting
Hi, I've got this exact problem with my S3. I am having a problem with how to root the device if it's still stuck on samsung logo after the firmware flash (successful). All guides use some in-phone options. Will I be able to follow the root guide from this page: without booting up the phone? Could someone please give me some advice or a link to a guide that I can follow? I know how to use ADB in later stages, I just don't know how to root when the phone is DEAD.

Thanks in advance

(initial problem: phone stuck on samsung logo, GT-I9300)
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