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I had a problem with my Nexus 7 (2013, 2nd gen) tablet.

I restarted my tablet and when it was rebooting again, it showed "Google" logo and then stood there. I wait it (around 20 minutes) but it did not do anything else.

Trying factory reset... [failed]

I have check many videos that suggesting apply a hard reset or factory reset, so I tried to do this. Once in Recovery mode, I notice that some error messages appear at bottom of screen, they are:

E:failed to mount /cache (invalid argument)
E:Can't mount /cache/recovery/log
E:Can't open /cache/recovery/log
E:failed to mount /cache (invalid argument)
E:Can't mount /cache/recovery/last_log
E:Can't open /cache/recovery/last_log
E:failed to mount /cache (invalid argument)
E:Can't mount /cache/recovery/last_install
E:Can't open /cache/recovery/last_install
E:Failed closing /dev/block/platform/msm_sdcc.1/by-name/misc (I/O error)
E:failed to mount /cache (invalid argument)

Then I selected wipe data/factory reset option and execute it. It started to formatting /databut then similar errores were flushed (here I copy log):

-- Wiping data...
Formatting data...
E:failed to mount /cache (invalid argument)
Formatting cache...
E:failed to mount /cache (invalid argument)
E:Can't mount /cache/recovery/log
E:Can't open /cache/recovery/log
E:failed to mount /cache (invalid argument)
E:Can't mount /cache/recovery/last_log
E:Can't open /cache/recovery/last_log
E:failed to mount /cache (invalid argument)
E:Can't mount /cache/recovery/last_install
E:Can't open /cache/recovery/last_install
Data wipe complete.
E:failed to mount /cache (invalid argument)
E:Can't mount /cache/recovery/log
E:Can't open /cache/recovery/log
E:failed to mount /cache (invalid argument)
E:Can't mount /cache/recovery/last_log
E:Can't open /cache/recovery/last_log
E:failed to mount /cache (invalid argument)
E:Can't mount /cache/recovery/last_install
E:Can't open /cache/recovery/last_install
E:Failed closing /dev/block/platform/msm_sdcc.1/by-name/misc (I/O error)
E:failed to mount /cache (invalid argument)

Here I show an image of recovery error messagesimage of recovery error messages

Trying unlocking device... [failed]

Some pages and forums suggest to flash and install another ROM, I have selected Cyanogenmod and following steps shown inCyanogen wiki page. The first step is unlocking device, this process starts formatting /data and then formatting '/cache', but again it cannot be mounted.


Finally... How can I fix these issue?

4
  • 1
    Have you tried Wugfresh Nexus Root Toolkit? Most of time Nexus devices can get fixed easily with the toolkit. – HasH_BrowN Dec 25 '14 at 19:44
  • The problem is the cache partition is an invalid format. Select "wipe cache partition" from the menu to fix it. – bain Apr 17 '15 at 21:12
  • @bain, Thank you for your comment. After select Wipe cache partition, it throws the same error message E: failed to mount /cache (invalid argument) and as your can think cache partition cannot be wiped or formatted if it is not mounted before. Do you have another idea? – Israel May 24 '15 at 0:03
  • I had the same issue but I pressed the Power Button along with Volume down solved the issue – Terril Thomas Jun 4 '17 at 15:36
1

Try booting into fastboot and run fastboot format cache and then fastboot erase cache.

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  • It does not work, format neve ends. – Israel Jul 18 '15 at 0:10
  • Do you get any error messages when running the commands? – LJD200 Jul 18 '15 at 8:42
0

I was seeing a very similar issue but in my case the "Formatting ..." step was not followed by a failed to mount message. In my opinion there is a hardware issue with your unit -- if the format fails such that the resulting partition can not be mounted, there's not much that can be done except attempt a warranty repair.

2
  • Thank you, before this error I replace the touchscreen, then I used it only some days and then this issue appear, Do you think that some hardware connection could be failing?, In this case, I should open it again and that everything is properly plugged. – Israel Jan 19 '15 at 16:25
  • Possibly -- I would have thought that the storage in question was soldered to the logic board without a socket (it is according to the iFixit teardown). – James in UK Jan 21 '15 at 17:08

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