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Inside the secure storage of your device's motherboard, there is a software flag (a toggle switch) that tracks security status. Currently, that flag is set to "Locked."
A very common mistake is being in the wrong boot mode. If you see the unlock_bootloader partition size reported as 0 , you are likely in "fastbootd" (userspace fastboot) rather than the bootloader itself.
(Replace stm32f1x with your specific chip series, e.g., stm32f4x ) . What to Do If Level 2 Lock Is Applied
Open a command prompt terminal or terminal window directly inside your Android SDK Platform Tools folder.
This long-form article will dissect every component of this error, explain why it occurs, and provide step-by-step solutions to unlock the "lock flag" and successfully flash your device.
Follow this guide to systematically resolve the issue.
Tap 7 times until you see "You are now a developer". Go back to System > Developer Options . Find OEM Unlocking and toggle it ON .
fastboot flashing lock
If the commands in Step 2 threw an error instead of unlocking the device, your manufacturer requires a proprietary tool to change the flashing lock flag.
It sounds like you’re seeing an error message from a printer, copier, or multi-function device (like a Canon, HP, Xerox, or Ricoh), rather than an issue with creating a paper document in software.
Common devices that enforce this flag include:
This error occurs when you try to use to flash files onto an Android device (often Motorola or Lenovo) while the bootloader is still protected by a software lock. Essentially, the device's security prevents any unauthorized changes to its system partitions. Android Open Source Project 🛠️ How to Fix the Error To resolve this, you must follow these steps in order: 1. Enable "OEM Unlocking" in Android About Phone Build Number seven times to enable Developer Options Developer Options OEM Unlocking USB Debugging 2. Execute the Unlock Command Connect your phone to your computer via USB. Use the command adb reboot bootloader to enter Fastboot mode. Run one of these commands based on your device age: Newer devices: fastboot flashing unlock Older devices: fastboot oem unlock Android Open Source Project 3. Specific Case: Motorola/Lenovo Many Motorola devices require a unique Unlock Key Motorola Unlock Portal You will need to run fastboot oem get_unlock_data to get a string of characters to submit to their site. ⚠️ Important Warnings Data Loss: Unlocking the bootloader wipes all user data (factory reset). This process typically voids your warranty Your device becomes less secure against physical tampering. Android Open Source Project 💡 Troubleshooting Tips
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You must bind your Xiaomi account in the "Mi Unlock Status" settings and use the official Mi Unlock Tool on a PC. There is often a mandatory waiting period (e.g., 168 hours).
After wait, successfully unlocked. Retry flash:
While frustrating, the "flashing lock flag is locked" error is a protective feature. It is the digital equivalent of a safety cap on a medicine bottle—it requires the correct deliberate action to remove.
Inside the secure storage of your device's motherboard, there is a software flag (a toggle switch) that tracks security status. Currently, that flag is set to "Locked."
A very common mistake is being in the wrong boot mode. If you see the unlock_bootloader partition size reported as 0 , you are likely in "fastbootd" (userspace fastboot) rather than the bootloader itself.
(Replace stm32f1x with your specific chip series, e.g., stm32f4x ) . What to Do If Level 2 Lock Is Applied
Open a command prompt terminal or terminal window directly inside your Android SDK Platform Tools folder.
This long-form article will dissect every component of this error, explain why it occurs, and provide step-by-step solutions to unlock the "lock flag" and successfully flash your device. Inside the secure storage of your device's motherboard,
Follow this guide to systematically resolve the issue.
Tap 7 times until you see "You are now a developer". Go back to System > Developer Options . Find OEM Unlocking and toggle it ON .
fastboot flashing lock
If the commands in Step 2 threw an error instead of unlocking the device, your manufacturer requires a proprietary tool to change the flashing lock flag. (Replace stm32f1x with your specific chip series, e
It sounds like you’re seeing an error message from a printer, copier, or multi-function device (like a Canon, HP, Xerox, or Ricoh), rather than an issue with creating a paper document in software.
Common devices that enforce this flag include:
This error occurs when you try to use to flash files onto an Android device (often Motorola or Lenovo) while the bootloader is still protected by a software lock. Essentially, the device's security prevents any unauthorized changes to its system partitions. Android Open Source Project 🛠️ How to Fix the Error To resolve this, you must follow these steps in order: 1. Enable "OEM Unlocking" in Android About Phone Build Number seven times to enable Developer Options Developer Options OEM Unlocking USB Debugging 2. Execute the Unlock Command Connect your phone to your computer via USB. Use the command adb reboot bootloader to enter Fastboot mode. Run one of these commands based on your device age: Newer devices: fastboot flashing unlock Older devices: fastboot oem unlock Android Open Source Project 3. Specific Case: Motorola/Lenovo Many Motorola devices require a unique Unlock Key Motorola Unlock Portal You will need to run fastboot oem get_unlock_data to get a string of characters to submit to their site. ⚠️ Important Warnings Data Loss: Unlocking the bootloader wipes all user data (factory reset). This process typically voids your warranty Your device becomes less secure against physical tampering. Android Open Source Project 💡 Troubleshooting Tips
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Follow this guide to systematically resolve the issue
You must bind your Xiaomi account in the "Mi Unlock Status" settings and use the official Mi Unlock Tool on a PC. There is often a mandatory waiting period (e.g., 168 hours).
After wait, successfully unlocked. Retry flash:
While frustrating, the "flashing lock flag is locked" error is a protective feature. It is the digital equivalent of a safety cap on a medicine bottle—it requires the correct deliberate action to remove.