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FASTBOOT(1) fastboot Manuals FASTBOOT(1)


fastboot - Android flashing and booting utility


fastboot [-w] [-u] [-s device] [-p product] [-c cmdline] [-i vendorId] [-b baseAddr] [-n pageSize] [-S size[K|M|G]] command


WARNING: This manual might be outdated, please refer to the official documentation.

fastboot is a command line tool for flashing an Android device, boot an Android device to fastboot mode, etc..


Erase userdata and cache (and format if supported by partition type).
Do not erase partition before formatting.
-s device
Specify device serial number or path to device port.
With devices command, list device paths."
-p product
Specify product name.
-c cmdline
Override kernel commandline.
-i vendorId
Specify a custom USB vendor ID.
-b|–base baseAddr
Specify a custom kernel base address (default: 0x10000000).
Specify a custom kernel offset (default: 0x00008000).
Specify a custom ramdisk offset (default: 0x01000000).
–tags-offset offset
Specify a custom tags offset (default: 0x00000100).
-n|–page-size pageSize
Specify the nand page size (default: 2048).
-S size[K|M|G]
Automatically sparse files greater than `size'. 0 to disable.
–slot suffix
Specify slot suffix to be used if the device supports slots. This will be added to all partition names that use slots. all can be given to refer to all slots. other can be given to refer to a non-current slot. If this flag is not used, slotted partitions will default to the current active slot.
-a, –set-active[=]
Sets the active slot. If no suffix is provided, this will default to the value given by –slot. If slots are not supported, this does nothing. This will run after all non-reboot commands.
On devices which support it, erase userdata and cache, and enable file-based encryption.
Do not buffer input or output.
Display version.
show this message.


fastboot update filename
Reflash device from
fastboot flashall
Flash boot, system, vendor, and (if found) recovery.
fastboot flash partition [filename]
Write a file to a flash partition.
fastboot flashing lock
Locks the device. Prevents flashing.
fastboot flashing unlock
Unlocks the device. Allows flashing any partition except bootloader-related partitions.
fastboot flashing lock_critical
Prevents flashing bootloader-related partitions.
fastboot flashing unlock_critical
Enables flashing bootloader-related partitions.
fastboot flashing get_unlock_ability
Queries bootloader to see if the device is unlocked.
fastboot erase partition
Erase a flash partition.
fastboot format[:[fs type][:[size]] partition
Format a flash partition. Can override the fs type and/or size the bootloader reports.
fastboot getvar variable
Display a bootloader variable.
fastboot set_active suffix
Sets the active slot. If slots are not supported, this does nothing.
fastboot boot kernel [ramdisk [second]]
Download and boot kernel.
fastboot flash:raw boot kernel [ramdisk [second]]
Create bootimage and flash it.
fastboot devices [-l]
List all connected devices (with device paths if -l is used).
fastboot continue
Continue with autoboot.
fastboot reboot [bootloader]
Reboot device [into bootloader].
fastboot reboot-bootloader
Reboot device into bootloader.
fastboot help
Show this help message.


The Android Open Source Project.