Failed -remote 39-flashing Lock Flag Is Locked. Please Unlock It First 39-- __full__ Jun 2026

A prompt will appear on your device screen. Use volume keys to select and press power to confirm.

The error occurs when you attempt to flash firmware or partitions to an Android device while its bootloader is still in a "locked" state. Simply enabling "OEM Unlocking" in your phone's settings is not enough; you must also execute the specific unlock command through Fastboot. Step 1: Preparation (In Android)

The review failure is a security block.

You enabled the permission in Android, but you didn't execute the final physical or fastboot hardware unlock protocol to change the status from LOCKED to UNLOCKED . Step-by-Step Guide to Fix the Lock Flag Error A prompt will appear on your device screen

Once the smartphone screen displays the Fastboot interface, confirm that your desktop workstation properly registers the attached architecture: fastboot devices Use code with caution.

Lock and unlock the bootloader | Android Open Source Project

Only if you have signed firmware from the manufacturer or use an EDL (Emergency Download Mode) box with authorized credentials. For most users, no. Simply enabling "OEM Unlocking" in your phone's settings

This error typically happens when a script or automated flashing tool attempts to write to sensitive system partitions while the critical hardware "lock flag" remains engaged. Below is a comprehensive guide to understanding why this happens and how to systematically resolve it. Why Does This Error Occur?

, require you to request a unique "Unlock Key" from their official support site using a string generated by the fastboot oem get_unlock_data

For MediaTek and Spreadtrum (Unisoc) devices, replacing the bootloader with an engineering version can bypass the lock flag check. Step-by-Step Guide to Fix the Lock Flag Error

If you still see the error, try the legacy command:

The lock flag is often tied to a server-side timer for Xiaomi. Patience is required.

sudo flashrom -p <your_programmer> --flash-name sudo flashrom -p <your_programmer> --wp-status

To solve this problem, we need to break down exactly what the Fastboot binary and your device’s bootloader are communicating.