E:failed to mount /efs (invalid argument) - AT&T Samsung Galaxy S II Skyrocket SGH-I727

Having some phone issues - Samsung Galaxy S II LTE (Skyrocket). I've Googled and searched these forums, I've tried every "fix" I could but haven't found anything that specifically matches my issue here. A few months ago I did have the sticky power button issue but I don't think this is the issue here given I am not getting multiple vibrations on the reboots.
I had CM 10.2 installed and running, did a factory reset/wipe dalvik & cache/wipe system and installed AOKP 4.3. Phone was stuck in a boot loop. Restored CM backup and phone still stuck in boot loop. Used ODIN to revert to factory stock image and phone is still stuck in a boot loop. Tried clearing cache and factory reset in stock recovery and phone is still stuck in boot loop.
As far as this boot loop it flashes at the SGS II LTE "S" logo for a couple of minutes, vibrates once then reboots. As well, as soon as I insert the battery, the phone turns on, holding the power button down to turn the phone off just reboots the phone.
Also in stock recovery, I see this:
-- Verifying internal MMC block --
E:failed to mount /efs (invalid argument)
E:Mount fail : EFS partition
Not need checksum confirmation
already executed!!...
E:failed to mount /efs (invalid argument)
E:failed to mount /efs (invalid argument)
# MANUAL MODE #
-- Applying Multi-CSC...
Applied the CSC-code : unknown
Successfully applied multi-CSC.
Any thoughts/ideas/possible fixes?

pixelens said:
Having some phone issues - Samsung Galaxy S II LTE (Skyrocket). I've Googled and searched these forums, I've tried every "fix" I could but haven't found anything that specifically matches my issue here. A few months ago I did have the sticky power button issue but I don't think this is the issue here given I am not getting multiple vibrations on the reboots.
I had CM 10.2 installed and running, did a factory reset/wipe dalvik & cache/wipe system and installed AOKP 4.3. Phone was stuck in a boot loop. Restored CM backup and phone still stuck in boot loop. Used ODIN to revert to factory stock image and phone is still stuck in a boot loop. Tried clearing cache and factory reset in stock recovery and phone is still stuck in boot loop.
As far as this boot loop it flashes at the SGS II LTE "S" logo for a couple of minutes, vibrates once then reboots. As well, as soon as I insert the battery, the phone turns on, holding the power button down to turn the phone off just reboots the phone.
Also in stock recovery, I see this:
-- Verifying internal MMC block --
E:failed to mount /efs (invalid argument)
E:Mount fail : EFS partition
Not need checksum confirmation
already executed!!...
E:failed to mount /efs (invalid argument)
E:failed to mount /efs (invalid argument)
# MANUAL MODE #
-- Applying Multi-CSC...
Applied the CSC-code : unknown
Successfully applied multi-CSC.
Any thoughts/ideas/possible fixes?
Click to expand...
Click to collapse
READ THIS B4 POSTING | THE MOST Common Questions Answered HERE goto the general section for sticky power button
inserting battery turns on phone is symptom of sticky power button.
your error message idk, could be because phone wont/cant stay on long enough to mount partitions

vincom said:
READ THIS B4 POSTING | THE MOST Common Questions Answered HERE goto the general section for sticky power button
inserting battery turns on phone is symptom of sticky power button.
your error message idk, could be because phone wont/cant stay on long enough to mount partitions
Click to expand...
Click to collapse
As I mentioned, I had the sticky power button issue about 3 months ago and I resolved it then, I just mentioned it because I was unsure if my current issue might be related. I read the rest of that post before I posted here and didn't see anything regarding the EFS issue.

pixelens said:
As I mentioned, I had the sticky power button issue about 3 months ago and I resolved it then, I just mentioned it because I was unsure if my current issue might be related. I read the rest of that post before I posted here and didn't see anything regarding the EFS issue.
Click to expand...
Click to collapse
if it starts as soon as you put the battery in the power button is the prob, afaik no one ever had the phone boot up reinserting the battery no matter what the state the phone was in, I even wiped the phone then pulled/reinserted the battery and the phone did not boot up.
next prob is you probably had a bad flash, why you had a bad flash idk, maybe a bad emmc, the only way to tell is to reflash stock, but u need to get to odin mode to do that but you cant get to odin because of the bootloop, reason behind bootloop is the sticky power button.
it could be dumb luck that both things happened at the same time. try to get into odin mode by either mashing the power button or cleaning it out to solve the bootloop

I can get into download mode and Odin. I've flashed stock and it still bootloops.
TL;DR:
1. Bootloop started with fresh AOKP 4.3 install
2. Bootloop continued with CWM restore to CM 10.2
3. Bootloop continued with CM 10.2 fresh install (everything wiped, even factory reset)
4. Bootloop continued with Stock install via ODIN
5. Factory reset and wiped cache in stock recovery and bootloop continues.
I think the power button is a separate issue from the bootloop - but I did try the fixes in the power button section just in case and no change.

Please share the steps to resolve bootloop
pixelens said:
I can get into download mode and Odin. I've flashed stock and it still bootloops.
TL;DR:
1. Bootloop started with fresh AOKP 4.3 install
2. Bootloop continued with CWM restore to CM 10.2
3. Bootloop continued with CM 10.2 fresh install (everything wiped, even factory reset)
4. Bootloop continued with Stock install via ODIN
5. Factory reset and wiped cache in stock recovery and bootloop continues.
I think the power button is a separate issue from the bootloop - but I did try the fixes in the power button section just in case and no change.
Click to expand...
Click to collapse
I too have the same problem. Have you resolved it. I have tried all the steps like get into ownload mode and Odin. I've flashed stock and it still bootloop. Please share the steps if you resolved. I don't know what to do
Thanks, KamaL

kingkamal said:
I too have the same problem. Have you resolved it. I have tried all the steps like get into ownload mode and Odin. I've flashed stock and it still bootloop. Please share the steps if you resolved. I don't know what to do
Thanks, KamaL
Click to expand...
Click to collapse
Do a factory reset in recovery

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Hi,
Yesterday i was trying to switch from lineage os to the last version of resurrection remix, so I downloaded the file on RR's website, and did a nandroid back up on my OPO (i'm rooted with TWRP installed) including system, data and boot partitions.
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Ok so i managed to replace the volume flex cable, but now i have another problem : after i failed to flash RR, i did a factory reset and tried to restore a nandroid back up (that i made just before i repaired the volume butttons) and now the phone won't boot and keeps booting on twrp... That is REALLY frustrating, please help !
croustiman27 said:
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Click to expand...
Click to collapse
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