Failed -remote 39-flashing Lock Flag Is Locked. Please Unlock It First 39-- ✓ ❲Best❳

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 .

Find the and tap it continuously 7 times until a toast message says "You are now a developer!"

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or flashing generic GSI system images onto Unisoc/Spreadtrum or MediaTek platforms. Why Fastboot Rejects Your Flashing Command If you are trying to flash a custom

Connect your phone to your computer and open a terminal/command prompt in your platform-tools folder. Type adb devices to see your device listed. Then, enter adb reboot bootloader . Your device should reboot into a dark screen with small text.

If you are seeing this error pop up in your command-line interface—whether you are using fastboot , trying to install a custom ROM, or unbricking a device—you have come to the right place.

Input the following command to transition your physical hardware into its low-level boot state: adb reboot bootloader Use code with caution. This link or copies made by others cannot be deleted

The "Failed -Remote 39:Flashing Lock Flag is Locked. Please Unlock it First" error typically arises due to security features implemented in the device's firmware. Manufacturers often include mechanisms to prevent unauthorized or accidental flashing of firmware, which could potentially brick the device or cause it to malfunction. The flashing lock flag is one such mechanism that locks the device, preventing any flash operations until it is explicitly unlocked.

A non-volatile memory bit (Option Byte) has been set, activating write or read protection.

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I ran into the dreaded error: failed - remote 39 - flashing lock flag is locked. please unlock it first

When modifying an Android device via ADB and Fastboot, commands like fastboot flash boot boot.img or running automated vendor flashing scripts require write access to system partitions.

fastboot oem unlock UNLOCK_CODE

Once the device reboots (or you manually boot back into fastboot), verify that the lock flag is gone by typing: fastboot getvar unlocked

(e.g., STM32F1 vs. F4).