Failed -remote 39-flashing Lock Flag Is Locked. Please Unlock It First 39-- New!
For Unisoc (SPD) devices, simply unlocking the bootloader is not always enough. The device checks an AVB (Android Verified Boot) vbmeta partition for a flag. A proven fix used by developers is to:
| Cause | Explanation | |-------|-------------| | Door / cover open | A toner access door, paper jam release cover, or front cover is slightly open. | | Interlock flag stuck | A small plastic flag that presses a microswitch is broken or stuck in locked position. | | Paper jam | Device locks all moving parts; flag stays locked until jam cleared. | | Fuser or drum unit not fully seated | Removable units have lock flags that must click into place. |
Several scenarios can lead to this error: For Unisoc (SPD) devices, simply unlocking the bootloader
Device manufacturers lock the bootloader and set the flashing flag as a critical security measure. It prevents unauthorized access to the system partition and ensures that the device runs only verified and official software. This helps protect user data from being compromised and prevents the installation of malware or system modifications that could lead to instability. A locked bootloader is also a prerequisite for using many security features, such as Verified Boot, which checks the integrity of the operating system each time the device powers on [14†L12-L14].
When attempting to modify an Android device's firmware, run custom ROM scripts, or flash individual partition images, encountering the error means your device's bootloader security mechanism is actively blocking any unauthorized modifications . | | Interlock flag stuck | A small
After hitting Enter, look at your phone’s screen. You will likely see a warning message asking for confirmation. Use the to select "Unlock the bootloader" and the Power button to confirm. Step 4: Verify the Status
You must remove the write protection before attempting to flash again. Here are the standard steps to do this: | Several scenarios can lead to this error:
: Unlocking usually requires physical confirmation by pressing a volume or power button on the device itself.
