Need help unbricking my S7 Edge! - AT&T Samsung Galaxy S7 Edge Questions & Answers

Hi all,
So I recently made the mistake of rooting my Samsung Galaxy S7 Edge (SMG-935A) while being a complete and total novice. I was able to root it fine (using ODIN), and then I tried to use some customization apps which messed up my phone. I tried resetting my phone and flashing the ROM again, and it messed my phone up even more.
First thing's first, when I try to boot up my phone, it will not go past the Samsung Galaxy S7 Edge Custom screen. It will stay there pretty much until the phone dies.
When I boot it up in recovery mode, it gives me an error message that reads:
"dm-verity verification failed....
E:failed to mount /system (Invalid argument)."
When I try to wipe my phone's data and factory reset it, it throws this error:
"E:failed to mount /system (Invalid argument)
can't mount '/system', rc = '-1' (Invalid argument)."
I have not seen anything on how to fix this specifically. Is there a way to fix this error and get my phone working again that I am unaware of? Or am I better off just getting a new phone? Anything you can do to help would be great. I've tried flashing stock ROMs and everything to no avail.
Thanks in advance.

captainclutch96 said:
Hi all,
So I recently made the mistake of rooting my Samsung Galaxy S7 Edge (SMG-935A) while being a complete and total novice. I was able to root it fine (using ODIN), and then I tried to use some customization apps which messed up my phone. I tried resetting my phone and flashing the ROM again, and it messed my phone up even more.
First thing's first, when I try to boot up my phone, it will not go past the Samsung Galaxy S7 Edge Custom screen. It will stay there pretty much until the phone dies.
When I boot it up in recovery mode, it gives me an error message that reads:
"dm-verity verification failed....
E:failed to mount /system (Invalid argument)."
When I try to wipe my phone's data and factory reset it, it throws this error:
"E:failed to mount /system (Invalid argument)
can't mount '/system', rc = '-1' (Invalid argument)."
I have not seen anything on how to fix this specifically. Is there a way to fix this error and get my phone working again that I am unaware of? Or am I better off just getting a new phone? Anything you can do to help would be great. I've tried flashing stock ROMs and everything to no avail.
Thanks in advance.
Click to expand...
Click to collapse
You should be able to flash back to stock with Odin. If you aren't on current B4 bootloaders, you need to know that if you on B2 or B3 that flashing the B4 bootloaders, you cannot go back to the previous versions (you will brick). The current stock G935AUCS4API2 (BL4) found HERE should get you back up and running again.

kangi26 said:
You should be able to flash back to stock with Odin. If you aren't on current B4 bootloaders, you need to know that if you on B2 or B3 that flashing the B4 bootloaders, you cannot go back to the previous versions (you will brick). The current stock G935AUCS4API2 (BL4) found HERE should get you back up and running again.
Click to expand...
Click to collapse
Hi, thanks for the help. I tried using the files from the link you provided but I got a "Complete(Write) operation failed" error from ODIN. Also on my "Downloading" screen, I now have a "SW REV CHECK FAIL : [about]Fused 4 > Binary 2" error. Any insight on that?
Thanks.

Try using Samsung smart switch on your pc to re-initialize your phone. It should be able to recover your device and put you on the newest firmware.

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[Q] need help with sm-n900a

Okay so I'm rooted via towel root, I've got a custom recovery thanks to safest rap 3.75 (twrp) I tried to install X note port for sm-n900a. It said it could only be installed to stock Tom slot so I did. It completed the install. I rebooted, and it failed to boot. So I went to recovery and now it's saying "unable to mount system, unable to mount systemrig, failed to restore system" I have tried to figure this out. But to no avail. I've resorted to creating rom slot 1 and installing dk and running on that, I want my stock back, anybody got any ideas here?

left without OS please help urgently

my phone: SM N900 india lollipop 5.0 out of the box
yesterday i rooted with chainfire's cf-auto-root first with odin
it went well, phone was rooted but i could not install a recovery
then i tried twrp.tar with odin
phone was rooted with twrp recovery v2.8.7.0
but when i tried to wipe data for new rom, it struck on formatting cache using make_ext4fs function
and it could not mount one or 2 things (system, cache...) and twrp restarted
now i could not even restore the backup i made before wiping
when i try to reboot , it says no OS installed
what to do guys, please help as i am staring the twrp screen right now
Flash a stock ROM via Odin and then proceed installing your ROM by flashing recovery...
Sent from my SM-N9005 using Tapatalk
Hello,
Try to install an official ROM, for your phone, with Odin then root again and install Custom recovery. I advice you to download latest build of recovery.
Sent from my SM-G901F using Tapatalk 2
thanks for the reply
will it be okay to select reboot to download mode when it is giving a message that no OS installed, are u sure to continue
PS. i am having TWRP v2.8.7.0 which is latest i guess
You have tried to install a new rom with Odin?
Sent from my SM-G901F using Tapatalk 2
bogdan109 said:
You have tried to install a new rom with Odin?
Sent from my SM-G901F using Tapatalk 2
Click to expand...
Click to collapse
i am still downloading firmware from sammobile
its very very slow, can someone tell a workaround?
Yes, downloading from sammobile.com is very slow unless you are a paid member.
If you want to run a custom ROM, there are ROMs that can work on your phone and would be faster to download. There are even ROMs that are based on Samsung's TouchWiz.
thanks guys for ur support
i was able to revive my note 3 again
but i did the whole rooting process again by auto-cf-root and then twrp latest through odin and i am still struck on the same screen like the last time in twrp recovery
it is still not able to mount system
can anyone has a solution?
thanks guys for ur support
i was able to revive my note 3 again
but i did the whole rooting process again by auto-cf-root and then twrp latest through odin and i am still struck on the same screen like the last time in twrp recovery
it is still not able to mount system
can anyone has a solution?
Flash supersu via TWRP instead of using cf-root.
audit13 said:
Flash supersu via TWRP instead of using cf-root.
Click to expand...
Click to collapse
but to gain root access, i assume auto cf root is the first step
correct me if i am wrong
Flashing supersu from TWRP will get you root access.
i am writing the messages twrp shows if they matter
updating partition details
E: unable to mount /cache
..done
E: resources (font)- (fixed) failed to load
E: unable to mount /cache
kernel doesnot have support for reading SELinux contexts
E: unable to mount /cache
E: unable to mount /cache
MTP enabled
E: unable to mount /cache
E: unable to wipe dalvik
updating partition details
E: unable to mount /cache
..done
E: unable to mount /cache comes multiple times later too
Steps: install again the rom, next step it is to install custom recovery with odin(The Rom and recovery must be in .tar format) and the last step, search for supersu in format zip and download in to sd card. Boot you phone in to recovery and install supersu. Now you will have an rooted phone.
Sent from my SM-G901F using Tapatalk 2
Maybe cf-auto-root is changing something in the phone to cause the error in twrp?
well i was third time lucky
repeated the same process 2 times:
rooted with cf-autoroot with odin, flashed twrp with odin, still freezes
3rd time:
flashed official rom
did a factory reset by inbuilt recovery
installed cf-autoroot, flashed twrp by odin
this time i was able to install aurora rom despite the error message in mounting cache
so running aurora rom now...
will try to flash supersu through recovery as recommended by @bogdan109
but will take a good night sleep first
mnm82 said:
well i was third time lucky
repeated the same process 2 times:
rooted with cf-autoroot with odin, flashed twrp with odin, still freezes
3rd time:
flashed official rom
did a factory reset by inbuilt recovery
installed cf-autoroot, flashed twrp by odin
this time i was able to install aurora rom despite the error message in mounting cache
so running aurora rom now...
will try to flash supersu through recovery as recommended by @bogdan109
but will take a good night sleep first
Click to expand...
Click to collapse
Check if your phone it is rooted or not (install an program from play store: root checker). I don't think it is necessary to install super from recovery, now when you used cf-autoroot, but maybe i'm wrong.
Flashing supersu from recovery means not having to use any other root tool.
thank u guys for ur replies
i dont know the reason of the problem but it seems almost sorted out now
what i did was i flashed older version of twrp twrp-2.8.6.0 and used suemax kernel
since then it seems okay though on running recovery it still tells one problem:
E: resources (font)- (fixed) failed to load
but everything else has been resolved for now
thank u again
Well.... did you use the right twrp? These are not all the same ones:
- Samsung Galaxy Note 3 Canada (hltecan)
- Samsung Galaxy Note 3 International Exynos (ha3g)
- Samsung Galaxy Note 3 International Qualcomm (hlte)
- Samsung Galaxy Note 3 Neo (hlltexx)
- Samsung Galaxy Note 3 Sprint (hltespr)
- Samsung Galaxy Note 3 T-Mobile (hltetmo)
- Samsung Galaxy Note 3 US Cellular (hlteusc)
- Samsung Galaxy Note 3 Verizon (hltevzw)

HELP!!! GT-I9300I(Samsung SIII Neo). Can't boot after trying to flash it to stock ROM

Hey, people.
I've looked for another threats on this, but seems like others really don't work, or I did something wrong.
So, I had Cyanogenmod for 6 months in this device but I wanted to reset it to stock rom. So I flashed it using Odin and, it was failing all the time for some authentication error. I flash stock recovery to if it would do any difference but no. I installed back TWRP and it was saying "E: Unable to mount '/data'" and '/ storage' too.
Now I cant even boot cyanogenmod because it never quits of "starting apps" after the boot loading.
Soooo... What should I do to resolve this?
Please any details? Did you try to reflash TWRP? Where did you find stock firmware?
You know i flash my device through odin a plenty of time and had no problem at all.
Send log

Nexus 6p bootloop

I tried to flash Android O, but failed... Now I'm flashing other roms, but still failing, every time i try to install system it tells me (invalid argument) please I need help.
This is not enough. Write the process you done for flash.
Are you tried the official guide at Google's site?

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