Newer Android devices often have a "userspace fastboot" mode called fastbootd. You can sometimes access it by booting into the standard bootloader and using the volume buttons to navigate to an option labeled "Enter fastboot" or by using the command fastboot reboot fastboot [8†L20-L21]. Flashing in fastbootd might bypass certain restrictions encountered in the normal bootloader mode.
Once your phone displays the Fastboot/Bootloader screen, run the standard unlock command: fastboot flashing unlock Use code with caution.
Tap the row 7 consecutive times until a toast notification reads, "You are now a developer!"
Note: If you are using an older device, use fastboot oem unlock instead. Step 4: Confirm on the Device Look at your phone screen. A warning message will appear. Use the to select "Unlock the bootloader". Press the Power Button to confirm. The device will wipe itself and reboot. ⚠️ Brand-Specific Considerations Newer Android devices often have a "userspace fastboot"
or use your device's specific key combination (usually Power + Volume Down) while booting. Run the Unlock Command
Connect the device to your PC using a high-quality USB cable. Android Open Source Project Step 3: Run the Unlock Command Open a command prompt or terminal in your platform-tools folder and run: For newer devices (2015+): fastboot flashing unlock For older devices: fastboot oem unlock Android Open Source Project ⚠️ WARNING: Unlocking the bootloader will factory reset
Always check the "Option Bytes" configuration in your programmer before starting a flash procedure. Once your phone displays the Fastboot/Bootloader screen, run
If the toggle is unclickable, connect to Wi-Fi. If it stays grey, your carrier may have permanently locked the bootloader (common with Verizon or AT&T models).
Before you can send the unlock command via your computer, you must give the phone permission to be unlocked from within the Android OS. Open on your phone.
To resolve this, you generally need to unlock the bootloader before the device will accept the flash command. Common Fixes A warning message will appear
Once you have finally unlocked the flag and are flashing successfully, consider adopting these practices to avoid running into this problem again:
Ensure your debugger is providing stable voltage (3.3V) to the chip. Unstable power can sometimes lead to flash corruption.