This is the most common and reliable method for devices with a fastboot interface. Step 1: Connect to your PC

: This is the most critical step. Most manufacturers lock the bootloader to prevent third-party software from being flashed.

This is the standard method for most non-Samsung Android devices. Connect your phone to your PC. Open a command prompt/terminal in your ADB folder. Type adb reboot bootloader to enter Fastboot mode.

fastboot devices