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

: These often require a unique "Unlock Code" obtained from the manufacturer's website.

Lock and unlock the bootloader | Android Open Source Project

If you receive an "unknown command" error, try the legacy command: fastboot oem unlock 4. Confirm on the Device

Dismiss Got it. On this page. Get into the bootloader. Unlock the bootloader. Lock the bootloader. Set lock and unlock properties. Android Open Source Project Fix Device State Locked Unlockable in Fastboot Mode : These often require a unique "Unlock Code"

If you have exhausted all the solutions above, consider seeking professional assistance. A hardware-level JTAG flash or a visit to a certified repair center may be necessary to use specialized equipment to rewrite the security registers.

The numbers flanking the error message are OEM-specific error codes (most commonly seen on devices utilizing MediaTek, Spreadtrum/Unisoc, or specific Xiaomi/POCO/Realme architectures). They point directly to a hardware-level restriction preventing partition modification. Root Causes of the Error

Failed -remote 39 — flashing lock flag is locked. Please unlock it first 39-- On this page

: Toggling the "OEM Unlocking" setting inside Android only permits the bootloader to be unlocked. It does not actually unlock it.

failed -remote 39-flashing lock flag is locked. please unlock it first 39-- Severity: High (Operation Aborted) Category: Security / Write Protection

Step 3: Handling Brand-Specific Restrictions Lock the bootloader

At its core, this error is a —not a bug. It appears when you try to write, modify, or "flash" new data onto a flash memory chip (the storage component of many devices), but a critical protection feature has been activated. Think of it as a "Read-Only Mode" that has been turned on to prevent accidental or malicious alterations to the device's core software.

The exact command depends on your device manufacturer. Below are the most common methods.

If the command gives an "unknown command" error, try the legacy command: fastboot oem unlock Use code with caution.

Open your terminal or command prompt inside your Google Platform Tools directory. Force the device to reboot into bootloader mode by typing: adb reboot bootloader Use code with caution.

The operation failed because the system (likely an ECU, bootloader, or microcontroller) has a enabled. This is a security feature designed to prevent unauthorized writing or flashing of firmware.