flash_factory_images.txt

# WARNING!!!
# flashing factory images using this method erases the user data
# including third-party apps installed

# make sure you have downloaded the Android SDK to perform adb & fastboot commands

$ adb reboot bootloader

# some devices may not have radio.img
$ fastboot flash bootloader bootloader.img
$ fastboot flash radio radio.img

# DO NOT skip this step
$ fastboot reboot-bootloader

$ fastboot flash recovery recovery.img
$ fastboot flash boot boot.img
$ fastboot flash system system.img

# for Nexus 9 only
$ fastboot flash vendor vendor.img

$ fastboot flash cache cache.img
$ fastboot flash userdata userdata.img

# profit!
$ fastboot reboot