Failed -remote 39-flashing Lock Flag Is Locked. Please Unlock It First 39-- |link| Access

Here’s a clear, helpful explanation of that error message, broken down for users or support documentation.

1. Attempting to Flash Unauthorized Firmware: Trying to flash firmware that is not authorized for the device can trigger the lock flag.
2. Previous Unsuccessful Flashing Attempts: If previous flashing attempts were unsuccessful or interrupted, the device might enter a state where the lock flag is set.
3. Device Locked by Manufacturer: Some devices come with a flashing lock flag set by the manufacturer to prevent users from modifying the firmware.

If you receive an "unknown command" error, try the legacy command:fastboot oem unlock 4. Confirm on the Device Here’s a clear, helpful explanation of that error

Expected output: unlocked: yes

Data Warning: Be aware that unlocking the bootloader will erase all user data on the device as a security measure. Flash with Fastboot - Android Open Source Project Attempting to Flash Unauthorized Firmware : Trying to