Failed -remote 39-flashing Lock Flag Is Locked. — Please Unlock It First 39--

After hitting Enter, look at your phone’s screen. You will likely see a warning message asking for confirmation. Use the to select "Unlock the bootloader" and the Power button to confirm. Step 4: Verify the Status

If you are trying to flash a custom ROM or update your device via Fastboot and encounter the error FAILED (remote: 'flashing lock flag is locked. please unlock it first') , it means your device's . After hitting Enter, look at your phone’s screen

Once enabled, reboot your device into (usually by holding Power + Volume Down while booting) and connect it to your PC. Use one of the following commands based on your device: Standard Android: fastboot flashing unlock . Older Devices: fastboot oem unlock . After hitting Enter