fastboot1

Android flashing and booting utility

Usage

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

Overview

WARNING: This manual might be outdated, please refer to the official documentation.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

Options

-w: Erase userdata and cache (and format if supported by partition type).

-u: Do not erase partition before formatting.

-s device: Specify device serial number or path to device port.

-l: 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).

--kernel-offset: Specify a custom kernel offset (default: 0x00008000).

--ramdisk-offset: 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.

--wipe-and-use-fbe: On devices which support it, erase userdata and cache, and enable file-based encryption.

--unbuffered: Do not buffer input or output.

--version: Display version.

-h|--help: show this message.

Commands

fastboot update filename: Reflash device from update.zip.

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.

Releases

6 releases since Debian 8 (Jessie); the text changed 5 times.

--kernel-offset since Debian 11 (Bullseye); --ramdisk-offset since Debian 11 (Bullseye); --slot since Debian 11 (Bullseye); --tags-offset since Debian 11 (Bullseye); --unbuffered since Debian 11 (Bullseye); --version since Debian 11 (Bullseye); --wipe-and-use-fbe since Debian 11 (Bullseye).

-b until Debian 8 (Jessie); -n until Debian 8 (Jessie).