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Problem installing Android KitKat (either Omnirom or Cyanogenmod)

Hi!
I'm experiencing an annoying problem while updating my XOOM (MZ605) with the latest KitKat ROM.
I followed the instructions to repartition my device, and I tried using both Omnirom and Cyanogenmod roms, but I get the same error everytime.
In the step of wiping everything (but the SD card), I get a couple of messages saying that it was unable to mount cache to E: drive. TWRP recovery system says that the wipe process failed. Anyway, I went further in the steps, and I was able to flash the room and the gapps (it passes the BigPart partition check), but when I boot into system, my xoom stays stuck at the splash screen; it is not booting.
I tried both Omnirom and Cyanogenmod, and I get stuck in the same place. I thought I messed some part, so undone the BigPart, installed stock rom from motorola, and started over. But got the same problem.
I would liek to know if anyone know whats going on with the partiitoning, and if I can get rid of the mounting errors.
Thank you!

toiel said:
Hi!
I'm experiencing an annoying problem while updating my XOOM (MZ605) with the latest KitKat ROM.
I followed the instructions to repartition my device, and I tried using both Omnirom and Cyanogenmod roms, but I get the same error everytime.
In the step of wiping everything (but the SD card), I get a couple of messages saying that it was unable to mount cache to E: drive. TWRP recovery system says that the wipe process failed. Anyway, I went further in the steps, and I was able to flash the room and the gapps (it passes the BigPart partition check), but when I boot into system, my xoom stays stuck at the splash screen; it is not booting.
I tried both Omnirom and Cyanogenmod, and I get stuck in the same place. I thought I messed some part, so undone the BigPart, installed stock rom from motorola, and started over. But got the same problem.
I would liek to know if anyone know whats going on with the partiitoning, and if I can get rid of the mounting errors.
Thank you!
Click to expand...
Click to collapse
In your process of wiping...did you try to wipe just the cache by itself. When I got that error message i would go back to the main menu in recovery and just wipe the cache (or whatever giving me an error message) by itself.

Same problem here
gooniegoogoo2 said:
In your process of wiping...did you try to wipe just the cache by itself. When I got that error message i would go back to the main menu in recovery and just wipe the cache (or whatever giving me an error message) by itself.
Click to expand...
Click to collapse
Same problem here... I can't properly do some of the advanced wipes in the process of trying to install omni.
I did as you suggested and tried wiping them individually but to no success.
I am definitely not as fluent in this stuff as a lot of you on here are, but I am competent/confident enough to follow good instructions.
Somebody help please!

Cant install KitKat Roms
I am having the same issue and have done the same thing. Tried installing both CM and OMNI with no success. the recovery is telling me the came thing that it cannot mount E:\ 'cache' and other files i need to wipe.
Some one please help.

i was wondering...
i was wondering if the fact that i used to have a custom rom and then reverted back to stock (relocked the bootloader and unrooted successfully) last year before i attempted the omni install could be a factor?

But it worked before
ohDevious said:
i was wondering if the fact that i used to have a custom rom and then reverted back to stock (relocked the bootloader and unrooted successfully) last year before i attempted the omni install could be a factor?
Click to expand...
Click to collapse
I'm getting the same "can't mount cache" error when converting to Big Part - I had previously been running several Big Part roms, and had no problem with the conversion at that time - I then reverted back to stock (using VZW OTA's) for awhile, but want to give the Big Part roms another shot - I've tried several methods of reverting to stock, then coming back to install a 10.1 ROM, which is successful, but when I flash the Big Part TWRP and try the conversion, I get the cache mount error every time - I can revert to the "normal" TWRP, reformat, and re-install non-big part roms without a problem - help us Obi Wan! WTF?

I was getting the same thing as you guys. Stuck on splash screen. What I did to fix mine was under TWRP go to wipe, did factory reset wipe, then data wipe. Then mine worked for me. Takes about 3-5 minutes to boot on 1st start after wiping. Hope this helps.
---------- Post added at 08:25 PM ---------- Previous post was at 07:50 PM ----------
lightnuup said:
I was getting the same thing as you guys. Stuck on splash screen. What I did to fix mine was under TWRP go to wipe, did factory reset wipe, then data wipe. Then mine worked for me. Takes about 3-5 minutes to boot on 1st start after wiping. Hope this helps.
Click to expand...
Click to collapse
I forgot to mention click the format data tab under wipe and type yes.

I just had this same experience. I think the directions are somehow missing a step or we're misreading it.
lightnuup said:
I was getting the same thing as you guys. Stuck on splash screen. What I did to fix mine was under TWRP go to wipe, did factory reset wipe, then data wipe. Then mine worked for me. Takes about 3-5 minutes to boot on 1st start after wiping. Hope this helps.
---------- Post added at 08:25 PM ---------- Previous post was at 07:50 PM ----------
I forgot to mention click the format data tab under wipe and type yes.
Click to expand...
Click to collapse

A day not spent well
I am having the same issue all of you guys are having. I had 10.1 stingray (4.2.2) running well and thought it was time to try Kit Kat. Both the ROMs wind up the same way, a loooong running splash screen (over an hour before I manually rebooted). Over and over no mater how many ways I tried to wipe the XOOM I kept getting the Can't mount the cache message. I was able to revert back to 10.1 but I can't figure why others can make the install and we cannot. I have asked others on the forum but no one can answer the question?
Anyone? Thanks! Paddy

I was finally able to figure this out last night. I was looking at my cache and data formats and both were formatted as f2fs. I believe it's under wipe in the latest TWRP (2.7.1.0), there's an option on the left that shows you the format type of your drives. On non BigPart TWRP I changed the cache and data to ext4. Rebooted back into recovery, and followed the guide posted here to apply BigPart to my Xoom: http://forum.xda-developers.com/showthread.php?t=2506997 :: Then I was able to load Omni BigPart edition with no issues at all. I'd be happy to give more details if anyone wants. I'm in the office now, otherwise I'd post some snap shots. I'll update this when I get home.

has anyone recovered from the "unable to mount cache" error? I have followed all the information in this thread, checked out the relevant links all to no avail.
The only additional data I can provide is that when I go into the wipe menu (TWRP 2.7.1) / advanced / select cache / and "repair or change" I have all 0's for the cache size MBs. Repairing the cache or changing file system claims to be successful, but it's always 0 MBs. For grins I tried all of the above with TWRP 2.6.3 and had no better results.
Thanks in advance.

Failed CM11 install on Wingray (E: can't mount /cache) Help! :(

I was trying to install CM11 on my Stock unrooted xoom, so I went ahead and followed cyanogenmod.org's guide.
It was great until the flashing CM part. And then, I got this error: System is not bigpart . (something along those lines.)
I found a same guy who had posted a solution to this.
So I go ahead and follow this, and when I flash BigPart TWRP 2700, I get this error on the device: Installation aborted. I used the sideload method for this.
I looked up some forum threads on how to fix this, and there was a thread which told me to install another version of TWRP BigPart, the R.A.H version. I did that by sideload, it installed, and I rebooted into recovery (after wiping dalvik cache). Teamwin loaded up fine, and I headed into the wipe section. According to the solution at ditoforge.com (link above), I had to go to advanced wipe and wipe everything BUT the sdcard. I did that, and I got this error: E: Can't mount /cache. I went ahead and flashed CWM through fastboot again, repeated the process, and no luck. Then, I went into fastboot and flashed TWRP Bigpart 2.7 directly using adb. It worked, though I got a series of errors upon trying to wipe (unable to mount /system, /cache, /data, etc)
I panicked, fearing a brick, and flashed back CWM. Luckily, I had taken a backup of Stock 4.1 and I restored back to that, thankfully finding it working. *phew*
I also tried fastboot format cache but I got this error on cmd:
Code:
C:\Users\User\Desktop\adb>fastboot format cache
formatting 'cache' partition...
Formatting is not supported for filesystem with type ''.
FAILED ()
Strangely, fastboot erase cache seemed to work.
I wanted to call quits, but I love CM11 and I would really like to give this a shot. Any help and tips would be really appreciated. Thank you all in advance.

Bump. Tried to use CWM recovery again after flashing, but now ADB doesnt work in recov. :\

Bump..
Any help would be appreciated..

I formated all partitions individually in TWRP and it worked... I.E, managed to flash CM11.
Hope that helps.
Now I'm back on CM10.1
Sent from my Nexus 5 using XDA Free mobile app

ATZ-007 said:
I formated all partitions individually in TWRP and it worked... I.E, managed to flash CM11.
Hope that helps.
Now I'm back on CM10.1
Sent from my Nexus 5 using XDA Free mobile app
Click to expand...
Click to collapse
I've tried that too, but I can't wipe any partition with TWRP. I get the error "E: Unable to mount /cache" with any partition. Thanks for the help though.

Bump.. help needed please..

Is no one active on the XOOM forums anymore? :|

Bump.

bumping a year later help pls

Same issue... Can't mount /cache
How can I manually format it?
Solved:
fastboot erase cache

[Q] TWRP crahes and reboots when wiping

I've read this issue with other devices, however. i've not found a solution for this yet
I'm new to this forums, let me know if i don't do something right.
I've been using Alberto97's AOSP Lollipop 5.1.1, it's my first custom rom install, i got it on
the first try, TWRP 2.8.6.0 running with no problems.. flashed other stuff like moto camera, marshmallow bootanim, and that's all
Last week i've tried to update to the CAF latest version of his build, however, TWRP
reboots when i try to wipe the /data partition, in the custom TRWP 2.8.7.0 thread found
i might need to repair the partition, i tried it with no success, repaired /cache with no problem, but when i try to fsck /data on TWRP it gaves me an error, haven't tried /system yet.
tried using CWM and it got stuck at wiping /data for like an hour (endless loop), i rebooted, the data was wiped, but i couldn't flash the ROM image, rebooted to clean system with no problems, it wipes cache and dalvik with no issues.
What's causing this? i have not faced apps FC or anything, just the TWRP random crashes at wiping, i'm using a Moto G XT1032 16GB TWRP 2.8.6.0 No custom kernel or non official recovery.
justpaste.it/wipedar
Leaving recovery.log on external page for reference.
hope you can help, thanks in advance.

Same problem here
You can use CWM by PhilZ for fixing what I think is a broken symlink to the emulated internal storage card.
I am using philz-6.58.7-falcon that you can find and download here: http://forum.xda-developers.com/showthread.php?t=2639583
Once you have flashed the new recovery you can go to "Advance menu", then to "change sdcard target" and define it to /data/media (you just have to tap on the option to set it).
Go back, select "Wipe option", then "Wipe User media" and the process should be successful.
If you reinstall TWRP and wipe "/data" now the rebooting problem should be gone and everything back to normal.
Hope this helps for you.
By the way this is my very first post here. So I hope I am doing this right.
Greetings.

Thank you for the help, i fixed it by repairing the userdata partition with the latest TWRP

Failed to mount /data (Invalid Argument) in Micromax Canvas Juice 2. Aq5001.

I have a custom rom downloaded. But to flash it, I need to erase everything. That I am unable to do because the recovery dosent wipe data. It led to a bootloop. I got back the stock firmware and tried again and same result. Further more, I cant even factory reset. I'm using TWRP 3.0. Someone please help!

Worpe said:
I have a custom rom downloaded. But to flash it, I need to erase everything. That I am unable to do because the recovery dosent wipe data. It led to a bootloop. I got back the stock firmware and tried again and same result. Further more, I cant even factory reset. I'm using TWRP 3.0. Someone please help!
Click to expand...
Click to collapse
If you have a flashing tool then flash the stock firmware again and then give it a try.
Hit Thanks if it helped
Sent from my titan using XDA-Developers mobile app

pg8286 said:
If you have a flashing tool then flash the stock firmware again and then give it a try.
Hit Thanks if it helped
Click to expand...
Click to collapse
Ive tried that 4 times till now. It has been in a bootloop thrice. And I flashed stock. I currently am using stock firmware but want to flash the custom rom. The recovery is failing to wipe data because it is failing to mount data.

Worpe said:
I have a custom rom downloaded. But to flash it, I need to erase everything. That I am unable to do because the recovery dosent wipe data. It led to a bootloop. I got back the stock firmware and tried again and same result. Further more, I cant even factory reset. I'm using TWRP 3.0. Someone please help!
Click to expand...
Click to collapse
Try this
1. Reboot to recovery (TWRP)
2. Select wipe.
3. Select advanced wipe.
4. Check system.
5. Repair or change file system.
6. Select change file system.
7. Select format type.
8. Swipe to change.
9. Select repair.

there is one problem with stock rom. its encrypts the data partition right after installing stock rom, therefore twrp can't access data partition. i had similar problem earlier. this is how i managed to fix.
solution: http://forum.xda-developers.com/showpost.php?p=67980158&postcount=7
i suggest you to stick with stock rom, because right now whatever roms or recoveries are made for this phone are blindly ported (just copy paste roms). i have tried about 3-4 roms for this phone, all had major bugs especially battery related. there is only one developer who made a stable rom so far is beingtejas, search his thread. if you really want to use a custom rom, try THIS rom made by gaurav kesarwani with help of beingtejas that is why i am suggesting it you otherwise it didn't worked for me atleast.

Worpe said:
I have a custom rom downloaded. But to flash it, I need to erase everything. That I am unable to do because the recovery dosent wipe data. It led to a bootloop. I got back the stock firmware and tried again and same result. Further more, I cant even factory reset. I'm using TWRP 3.0. Someone please help!
Click to expand...
Click to collapse
Use TWRP 2.8.7. 3.0.0 is a can of bugs...

optimumpro said:
I have a custom rom downloaded. But to flash it, I need to erase everything. That I am unable to do because the recovery dosent wipe data. It led to a bootloop. I got back the stock firmware and tried again and same result. Further more, I cant even factory reset. I'm using TWRP 3.0. Someone please help!
Click to expand...
Click to collapse
Hey You should have to try doing these steps these will helps you-
1.First after wiping cache and dalvik cache FLASH SUPER SU ZIP FILE
2.AFTER THAT FLASH THE ROM AND THEN REBOOT, it will solve the problem.

vickysoni said:
Hey You should have to try doing these steps these will helps you-
1.First after wiping cache and dalvik cache FLASH SUPER SU ZIP FILE
2.AFTER THAT FLASH THE ROM AND THEN REBOOT, it will solve the problem.
Click to expand...
Click to collapse
my internal storage is showing 0 i can download apps from playstore but can't download things from browser can't even take a screen shot

first wipe data and than goto advance wipe options and wipe all but do not wipe microsd
it is success full than install custom rom

can't mount data
I'm using cwm recovery, while factory resetting it can't
mount / data. Please help me.
Thanks

Galaxy S7 930f can't access twrp

Hello, thanks for your help.
It seems I bricked my galaxy s7 while trying to format the /data partition.
I installed TWRP 3.2 and a custom rom, and everything went smoothly until then.
I tried installing an audio mod which throwed a " can't mount /data" error, searching for solutions I read that formatting the data partition to fat and back to ext4 should solve the problem, I tried formatting it to fat with TWRP, however on the first try I got a message that it suceeded, followed by a message that /data could not be mounted, TWRP seemed to be still working (there was no reboot button or any other buttons, just a "working" bar). After giving the phone 3 hours I decided to restart it, now I can't access TWRP; it stays on it's "splashcreen", and of course the phone won't boot.
I'm having a rough time with this so I will appreciate it a lot if you can help me.
Thank you.

Boot to download mode, flash stock firmware using Odin, then retry the TWRP installation.
For wiping data, you have to make sure you use the wipe option that makes you type out 'yes' to wipe, the other factory wipe methods don't actually properly wipe the partition.
iirc you also then need to flash the dm no verity zip from the TWRP thread.

Bro you didn't have to do anything but just formating the phone in the first place. Aassuming you're on oreo , it happens to a lot of people and myself, after flashing a kernel twrp was unable to munt data, all i had to do is a data format in twrp that fixed the problem .