Failed -remote 39-flashing Lock Flag Is Locked. Please Unlock It First 39-- ✅
The error message is a security safety block triggered by the Android Fastboot framework . It prevents the modification of core device partitions when the bootloader is locked.
If you still see the error, try the legacy command:
The "failed -remote 39 — flashing lock flag is locked" error indicates a lock preventing flash writes. Rapid resolution requires determining whether the lock is reversible; use vendor unlock procedures when available, update tooling, and implement pre-flash checks and controls to prevent recurrence.
Before diving into unlock methods, ensure the following: The error message is a security safety block
Even if your phone is stuck in a boot loop or Fastboot mode, if the master security lock flag has not transitioned from a LOCKED state to an UNLOCKED state, partition rewrites are structurally forbidden. Step-by-Step Resolution Guide
Find the and tap it continuously 7 times until a toast message says "You are now a developer!"
This error occurs when you try to perform an operation (e.g., flashing firmware, writing data, or modifying a device) while the device’s is enabled. The “39” likely refers to a specific error code from the tool or device firmware. Rapid resolution requires determining whether the lock is
This error typically occurs when trying to flash firmware or system images to an Android device (often those with Unisoc/Spreadtrum chipsets) via while the bootloader is still locked.
Scroll down and ensure the toggle switch is also enabled.
fastboot oem unlock-go fastboot flashing unlock_critical The “39” likely refers to a specific error
Attempting to write partition code inside traditional Fastboot mode instead of switching to user-space FastbootD mode on newer Android systems.
: Certain hardware brands require a SIM card network handshake to authorize the OEM toggle. Ensure your phone has active cellular data enabled if the selection remains grayed out. Phase 2: Resolving the Lock Flag via Command Line