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cache no mount, cant unlock bootloader
I pray you can help
i have a nexus 7 2012 that was running slow.
it froze and i turned it off/on but it froze at the google logo
i read to factory reset through recovery
this failed/halted at
after this i tried to clear the cache
i then tries to unlock the bootloader to install a factory image via fastboot
C:\google>fastboot oem lock
(bootloader) Bootloader is already locked
OKAY [ 0.022s]
finished. total time: 0.023s
C:\google>fastboot oem unlock
(bootloader) erasing userdata...
(bootloader) erasing userdata done
(bootloader) erasing cache...
(bootloader) erasing cache done
FAILED (remote: (Unknown error code))
finished. total time: 5.705s
ive also tried adb sideload...
it cant mount /cache