Step 5: Boot Your Android Device into Bootloader/Fastboot Mode.Step 4: Get an Unlock Key From Your Device Manufacturer.Step 3: Enable USB Debugging and OEM Unlocking on Your Device.Step 2: Install Android SDK Platform-Tools on Your PC.Step-by-Step Guide on How to Unlock the Bootloader using Fastboot on Android Devices.What is a Bootloader and Why Would You Need to Unlock it?.