Although this command works with most of the devices, it won’t work for some brands. The Fastboot OEM unlock command is the most popular command, it is your key to unlock the bootloader of your device. Syntax: fastboot devices Fastboot OEM unlock command However, if the result is empty then you might want to check the fastboot installation and drivers. Type Fastboot devices in the command prompt and result should be a serial number, similar to the adb devices command. If entering this command shows your device name with a serial number, it implies that your phone is good to go for fastboot operations. Come back to Settings > Developer Options > USB debugging and enable it.You’ll see a message “You’re a developer now.”.Go to Settings > About > Build Number and Tap for 7 times.Enable USB Debugging, to do so, You’ll need to enable Android developer options:.

(This method requires ADB, However, you can also check our guide which has key combinations to boot your device into fastboot mode.)

Boot your device into fastboot mode/bootloader mode.

ADB and Fastboot installed on your system.

To make it easier, we’ve added a short description, syntax and an example. To execute the below mentioned commands, you’ll also need to have Fastboot installed on your computer system, You can follow our guide to install ADB and Fastboot for the installation. Now that you have Fastboot working on your system, you can check the below commands. These are probably the most useful tools available which will come to rescue when you brick your device or when you want to replace your device partitions. As mentioned above, the Fastboot commands would work even if the OS isn’t booted, provided your device is booted into Bootloader/Fastboot mode.

Hence, the Android debugging tools can’t communicate to the phone. When you’re working on the bootloader mode, ADB commands will no longer work, as the device is not booted into Android OS.

Fastboot Reboot/reboot-bootloader commands.

Minimal adb fastboot flash image