To bypass this error and successfully flash your device, you must transition the device state from LOCKED to UNLOCKED . This requires a combination of enabling operating system permissions and executing explicit command-line protocols. Root Cause: Why Does This Error Occur?
After preparing the system flag layout, you must interface with the hardware using a terminal or command prompt environment via a computer.
This typically appears when:
The flashing lock flag is currently locked. Please unlock the bootloader first before attempting to flash. [Learn how to unlock] | [Cancel]
Go to and find the Build Number (or MIUI version/Software version). flashing lock flag is locked please unlock it first full
[Settings] ➔ [About Phone] ➔ Tap "Build Number" 7x ➔ [Developer Options] ➔ Enable "OEM Unlocking" & "USB Debugging" Phase 2: Enter the Correct Bootloader Interface
If you're still stuck or want to double-check your steps, tell me the of your device and which flashing tool you are using so I can give you the exact command or method for your phone. Share public link
Shut down completely, unplug the power, wait 30 seconds, and reboot.
Press and hold the Child Lock button, or hold Delay Wash and Pre Wash together. To bypass this error and successfully flash your
Some devices are (e.g., certain US Samsung models, Verizon phones). In that case:
Some industrial modules (like Quectel or IoT devices) have an extra feature. If the device detects you are trying to flash an image that is not signed by the manufacturer’s private key, or if you previously flashed an incorrect image, it triggers a security mechanism that permanently locks the flashing flag to protect the hardware.
Connect your device to the computer using a high-quality USB cable.
It is one of the most maddening errors in modern tech. It sounds like a riddle: If the lock is locked, how do I unlock it? And what is a "flag" doing inside my hardware? After preparing the system flag layout, you must
These are various ways the system says, “ “
Your phone screen will go dark and show a fastboot logo or a layout containing text details. Confirm the computer still sees the device: fastboot devices Use code with caution.
Android devices ship with a locked bootloader to ensure that only software digitally signed by the manufacturer can run. The "Flashing Lock Flag" is a software switch within the bootloader that determines if you are allowed to write data to system partitions. If this flag is active (locked), any command to flash an image will be rejected by the device to prevent "bricking" or malicious software installations. Android Open Source Project How to Unlock the Flashing Flag