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

DarkFamiliarity

Senior Member
Apr 7, 2012
283
33
48
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. :)
 
Last edited:

ATZ-007

Senior Member
Sep 7, 2009
1,152
325
113
London
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
 

DarkFamiliarity

Senior Member
Apr 7, 2012
283
33
48
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
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.
 

Xenosis

Senior Member
Apr 12, 2011
215
25
0
Same issue... Can't mount /cache

How can I manually format it?

Solved:

fastboot erase cache
 
Last edited: