"unable to mount /system" in TWRP - UMi ZERO Questions & Answers

Hello, I was trying to install ROM Arcatarc's EMUmIZERO SUPERLEGGERA. I installed TWRP v2.8.2.0, I did backup of all my data and system, wiped it and tried to install that ROM, but always got message "unable to mount /system". So I tried to restore my backup, but always ended with same message "unable to mount /system". I got this message when I do pretty much everything. Now I have no system and cannot use my phone. Please help.

Place it first with ROOTJOY restores. Then TWRP and play the backup back.
.http://www.mediafire.com/?zmxrc7kxkczppse

When I use twrp (gt i8262) to install any custom rom,it shows "unable to mount "system.
Plz help

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[SOLVED] Galaxy S I9000B not booting, no recovery mode

I rooted and installed CM7 on my SGS i9000B about 1 month ago. Everything was going fine and I was in love with my phone.
This afternoon, suddenly and with no apparent reason, it started giving me infinite "Force Close" messages to all apps I tried to open, making the phone pretty useless. Whe this happened I tried repairing permission from within Rom Maanger but the problem persisted. So I booted in recovery mode (Clockwork Mod Recovery) and tried fixing permissions there, but force closing problem was still there.
I had an Nand backup from the day I installed CM7. So I went to recovery mode again and tried restoring the backup, but it gave me an error (I believe it was somwthing related to disk space, but I'm not sure about that). So I did another backup (just in case) and tried to reboot the phone to try restoring backup again.
The problem is, now I can't get to recovery mode again. When I rebooted I was not able to go back to recovery mode anymore. I am still able to get to Download mode though. So I was thinking about flashing some rom/bootloader or something back in from Odin, but as I have no experience doing this, I believe it's safer to ask for help here before doing anything to the phone.
I believe it's not bricked yet, since I can still get to download mode.
Can anyone give me some detailed info about what I should do?
Do flash Kernel one more and,
Do root again and try that working.
If it happend again, wipe dalvik-cache and after your device is rebooted, try again in CWM.
evernet21 said:
Do flash Kernel one more and,
Do root again and try that working.
If it happend again, wipe dalvik-cache and after your device is rebooted, try again in CWM.
Click to expand...
Click to collapse
Sorry but I have very little experience with this and I want to be sure about what I'm supposed to do. What do you mean by flash kernel again? Is it flashing CyanogenMod 7 again via Odin?
I flashed the kernel again using Odin. Used the same file that I used before (when I fisrt rooted the phone a month ago - speedmod k13C). Now I can get into Recovery Mode.
But now I have a different problem. I tried to do a nandroid restore (backup and restore - restore ALL) but I have some errors related to mounting errors:
Code:
Checking MD5 sums...
Restoring system...
E:Can't mount /dev/block/st19 to /system with parameters auto llw.check=no
(File exists)
Error mounting /system/!
Skipping format...
E:Can't mount /dev/block/st19 to /system with parameters auto llw.check=no
(File exists)
Can't mount /system/!
I have no idea what that means.
Any help?
While searching for help on this error I found some people saying that flashing stock rom back intro phone could solve the problem. So this was what I did. Flashed stock samsung rom back i using Odin but when phone rebooted the following error appeared:
Android system recovery <3e>
Samsung Recovery Utils
- for BML -
[some recovery options]
update media, please wait
E:Can't mount /dev/block/st110
(Invalid argument)
E:copy_dbdata_media:Can't mount DBDATA:
So I have a very similar error - "can't mount /dev/block/SOMEFILE". It looks to me like a problem with the internal sd card. What do you guys think?
Solved
I could solve the problem using the method described in this thread.
http://forum.xda-developers.com/showthread.php?p=14732179#post14732179

[Q] Problem with CWM / can't flash rom or restore backup

Hello,
i got my root access running yesterday and backed up my apps with Titanium Backup.
Then it was time to flash cm 10.2. I backed up my stock rom and then wiped the data and cache partition.
Then I tried to flash cm, but it gave me an error. Now if I start cwm, the following errors appear:
Clockworkmod Recovery v6.0.3.2
E: Can't mount /cache/recovery/command
E: Can't mount /cache/recovery/log
E: Can't open /chace recovery/log
E: Can't mount cache/recovery/last_log
E: Can't open /cache/recovery/last_log
When I try to flash CM also errors occur.
I also can't restore my backup, the following error appears: MD5 mismatch!
Please help me, it is quite urgent
Thanks A LOT in advance.....
Best regards, Simon
E: I have the I9505, if I forgot something else, please tell me, my start in that day was so terrible and it's only 7o'clock
E2: when I try to flash CM 10.2, the following messages appear:
-- Installing: /external_sd/AROOT/cm-10.2-jfltexx.zip
E: can't mount /cache/recovery/last_install
E: failed to open last_install: Invalid argument
Finding update package....
Opening Update package....
Installing Update....
Install from sdcard complete
Then when I try rebooting it doesn't go further then the CM Logo, which spins...
re: MD5
cH33zBurGer said:
Hello,
i got my root access running yesterday and backed up my apps with Titanium Backup.
Then it was time to flash cm 10.2. I backed up my stock rom and then wiped the data and cache partition.
Then I tried to flash cm, but it gave me an error. Now if I start cwm, the following errors appear:
Clockworkmod Recovery v6.0.3.2
E: Can't mount /cache/recovery/command
E: Can't mount /cache/recovery/log
E: Can't open /chace recovery/log
E: Can't mount cache/recovery/last_log
E: Can't open /cache/recovery/last_log
When I try to flash CM also errors occur.
I also can't restore my backup, the following error appears: MD5 mismatch!
Please help me, it is quite urgent
Thanks A LOT in advance.....
Best regards, Simon
E: I have the I9505, if I forgot something else, please tell me, my start in that day was so terrible and it's only 7o'clock
E2: when I try to flash CM 10.2, the following messages appear:
-- Installing: /external_sd/AROOT/cm-10.2-jfltexx.zip
E: can't mount /cache/recovery/last_install
E: failed to open last_install: Invalid argument
Finding update package....
Opening Update package....
Installing Update....
Install from sdcard complete
Then when I try rebooting it doesn't go further then the CM Logo, which spins...
Click to expand...
Click to collapse
Go into CWM and or Rom Manger and find the option where it says "Ignore MD5"
or something to that effect and try restoring your nandroid backup with MD5 disabled.
The best thing you can do is download TWRP custom recovery for your specific phone's
model (i9505) and restore your nandroid backup using that, it's a lot better than cwm or
rom manager, and its also all "touch" and has large tabs to click on.
TWRP has the MD5 checking as an option which you cannot miss when you are creating
a nandroid backup or restoring one.
Good luck!
I am not 100% sure if cwm/rom manager has that MD5 option which
you can enable or disable. (I forgot, been so long since I used it).
I checked and I couldn't find an option to ignore MD5. Then I looked for it in google (for cwm). There I found, that a backup can be truly corrupted which could seriously harm the phone. Therefore I don't dare trying to restore my backup with another recovery...
Is there a way to fix the problem that cwm has? With beeing unable to mount or open the stuff I mentioned in my first post and therefore somehow hindering my system to start.
Thanks so far!
Wow, this is all really strange. I now formated chache (only works when cwm is rebootet in cwm). Then the errors do not occur again. Then I formated my data again, got stuck, shut my device on and tried again, then it worked. The same thing for installing cm. First try it gets stuck, second try it works....wtf..?
Well now it runs, but I am really not content with how it worked out...

E: unable to mount otg

I see the error while using twrp, according to log E: unable to mount otg than updating partitions so should i flash custom room with this error as i flashed modded apps with twrp it says done but apps was not installed, how to solve this log error of twrp and what to do this is a problem or only information kindly tell me i should go for flashing ROMs or try some other mods to check that it is flashing it or not.

TWRP backup issue on S7 Edge ""failed to mount data" and "failed to recreate folder"

TWRP backup issue on S7 Edge ""failed to mount data" and "failed to recreate folder"
Using twrp recovery 3.0.2-2 (latest) and trying to do an image backup, the message just says: "failed to mount data" "failed to recreate folder" . Additionally, it shows 0 MB internal storage.
I tried to backup to an external USB and at the end of the process this message comes up "Failed to create backup. Clearing up folder".. but It backups SYSTEM partition but nothing else (no EFS, no BOOT).
Does anyone experience the same issue at the time of backups with TWRP?
SOLUTION: TWRP need to wipe the data partition in order to allow backup creation as far as I understood.
find more regarding procedure at official TWRP thread

Need help, can't flash custom rom because of failed to mount '\vendor'

Hello all, I tried flashing my Mi A1 using Evolution-x rom from twrp 3.6.1_9-0, but it failed because there's an error message that said: "Failed to mount '\vendor' (Invalid argument)".
I tried wiping my cache, system, and data to no avail. I tried using "Format Data" on wipe menu, and still displaying the same error.
Is there someone that having this same problem or have the solution? Thank you in advance
just ignore it
Simply ignore it, flashed Project Elixir today with same message, phone is working fine.
That because you are installing a treble compatible rom.
Search it up online.
You can simply ignore the message and reboot or flash gapps or whatever, if needed.

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