Fastboot is a powerful utility that Android developers use to write and upload binary images to devices over the USB or Ethernet. The utility is available on all android devices that have the bootloader unlocked, and it can be used to flash boot, recovery, system, and vendor images, among others, on a device.
One unique feature of fastboot is that it runs in bootloader mode and enables users to send commands directly from a connected host device to a connected android device's bootloader. With fastboot, you can perform various operations on an android device, including unlock the bootloader, flash firmware, repair bad sectors, and even unbrick a device.
To use fastboot commands on an android device, you need to have Fastboot installed on your computer. You can download the latest version of fastboot from the Android SDK platform tools or ADB and Fastboot zip file. Once you have installed Fastboot on your computer, you can open your command prompt or terminal window to use fastboot commands.
Here is a list of some common fastboot commands you can try on your android device:
1. Fastboot Devices
When you connect your device to your computer and want to see if Fastboot recognizes your device, use the Fastboot Devices command. This command will display all the connected devices in fastboot mode on your computer.
Command: fastboot devices
2. Fastboot Flash
Fastboot flash is the most important command in fastboot because it's used to flash firmware, images, partitions, and custom recovery or boot files on a device. In most cases, you need to unlock your device's bootloader before you can flash firmware or custom files.
Command: fastboot flash <partition> <filename>
3. Fastboot Boot
Fastboot boot is a command that boots a bootloader, recovery or kernel image on the connected device without flashing permanently. This Fastboot command is useful when you want to test a custom recovery or kernel before permanently flashing it on your device.
Command: fastboot boot <filename>
4. Fastboot Secureboot
The fastboot secureboot command is used to lock or unlock the bootloader. Suppose your device is still in a locked state, and you want to flash a custom ROM or recovery. In that case, you need to unlock your device's bootloader first. However, it is important to note that unlocking your bootloader wipes your device's data completely.
Command: fastboot oem unlock or fastboot oem lock
5. Fastboot Erase
Fastboot erase is a command that erases any partition or data on your android device. It is a useful command when you want to erase all the data on a device or restore a malfunctioning device. The "userdata" partition is the most commonly used partition with this command.
Command: fastboot erase <partition>
6. Fastboot Getvar
The fastboot getvar command is a command that displays bootloader variables on an android device. It helps to check your device's bootloader status or to check if your device is compatible with a particular firmware or custom file. You can use Fastboot getvar to check your device’s bootloader version, security status, and OEM unlock status.
Command: Fastboot getvar <variable name>
7. Fastboot Reboot
The Fastboot reboot command reboots an android device that is connected to a host device in Fastboot mode. This command is useful when you need to restart your device after making changes to the device's firmware files, or when you want to reboot your device into recovery mode.
Command: Fastboot reboot
8. Fastboot Devices
When you connect your device to your computer and want to see if Fastboot recognizes your device, this command will display all the connected devices in fastboot mode.
Command: Fastboot Devices
Conclusion
Fastboot commands are powerful and useful commands for android developers and enthusiasts who want to modify or repair their devices. Understanding Fastboot flash, reboot, erase, and other fastboot commands gives you more control over your device, and you can customize or troubleshoot your device without hassle. Be sure to follow the fastboot instructions carefully and always back up your device's data before using fastboot commands because some commands can wipe your device entirely and permanently damage your device if used incorrectly.
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