I have personally used this method to fix osrs max str bonus gear failed to mount cache partition on my Nexus.
Now Press, volume down button twice.
If this guide fixed the error.
Note: If your phone fails to clear cache again.I spend some time looking for its fix and it the end I was successful.Update (July 7th,2016 I used the above guide to fix my phone when I had the same error.When this error (Failed to mount cache) occurred on my girlfriends LG Nexus 5, I didnt have any clue on how to fix it, I tried a lot of things, one thing I didnt try was factory reset as it would have deleted all her.A screen will appear with Android on the back and.If you are facing the same issue then try out the below guide to fix failed to mount cache error.Now select the option Reboot System Now from the same screen.If it is not working for you then you should try flashing stock firmware/software on your phone: Use this guide to flash stock firmware on Nexus phones.There I saw this error failed to mount cache (Invalid Argument).
Now use volume buttons to navigate.
Press power button to select.It had all our memories and messages that we couldnt afford to lose.It will fix the issue.Recovery OF juice 2 IS here: GET_IN_touch, facebook: Google plus: Twitter: @shuklaaditya846, instagram.There are cases when this error arises because of some hardware issue, then you can not fix it by tweaking the software or operating system.