While in bootloader, I connected a USB cacble and ran this command to erase cache:

#> fastboot flash cache cache.img 
target reported max download size of 1073741824 bytes
erasing 'cache'...

PROBLEM: It has been running for 10 minutes already. The phone's screen still says erasing....
The cache.img is 14 MB, downloaded from Google.

Should I give up?
About how long does it usually take? A few seconds, a few minutes, a few hours?

  • For a particular reason I can't use erase. Thanks for the info, feel free to make that an answer, thanks! Aug 18, 2016 at 9:53
  • Just being curious: why would one want to download and flash a cache partition image?
    – Izzy
    Aug 18, 2016 at 11:29
  • @Izzy: I was wondering that too as well haha... erase does not work so I am trying to understand what is wrong. My phone is probably dead, so I might as well try that, never know, a miracle could occur :-) Aug 18, 2016 at 11:36
  • If you have a "twin" of that device (or another device with a cache partition of the same size, or can create an image with an empty partition using the same file system), there might be another approach: finding what partition corresponds to it (i.e. /dev/mmcblk*), and then simply cat cache.img > /dev/mmcblkX. That's the approach I often use to flash recovery on devices not having a proper bootloader mode (like my LG P880), and also my Adebar creates scripts for ;)
    – Izzy
    Aug 18, 2016 at 11:41

1 Answer 1


Why flash cache? Just erase or format would be enough.

Comment made me curious - care to share for what reason erase is unusable?

Either way it should only take a few seconds. Try flashing some other partitions (ones that won't touch your data, of course) and see if they pass.

  • erase actually fails on my device: android.stackexchange.com/questions/154827/… I will need to try format. Aug 18, 2016 at 10:21
  • Thanks for the score! I had an answer in that question too, didn't realize the 2 questions are linked together...
    – Andy Yan
    Aug 18, 2016 at 10:29
  • Also, I came across link which seems to indicate format is not a good idea. Anyway, you now have format and factory image as last resorts; if those fail I'd put the blame on hardware.
    – Andy Yan
    Aug 18, 2016 at 10:30

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .