Failed -remote 39-flashing Lock Flag Is Locked. Please Unlock It First — 39--

Lock and unlock the bootloader | Android Open Source Project

Android devices are shipped with the bootloader locked to prevent malware, unauthorized OS changes, or data tampering.

For MediaTek and Spreadtrum (Unisoc) devices, replacing the bootloader with an engineering version can bypass the lock flag check.

, require you to request a unique "Unlock Key" from their official support site using a string generated by the fastboot oem get_unlock_data Lock and unlock the bootloader | Android Open

# First, try to read the flash to see if it's accessible at all sudo flashrom -p <your_programmer> -r backup.bin

Unlocking your bootloader carries risks. Complete these steps first:

, which requires both a setting change in the OS and a specific command in Fastboot mode. Android Open Source Project Step 1: Enable OEM Unlocking (In Android OS) Complete these steps first: , which requires both

⚠️ Accepting the unlock screen on your device completely erases all personal data, apps, and internal memory directories to prevent unauthorized data access. Step 4: Verify the Unlock Ability State

Note: Some devices will display a confirmation prompt on the phone screen. Use the Volume keys to select "Yes" and the Power button to confirm. If you receive a "Command failed" or "Unknown cmd" error:

"Flashing lock flag is locked" means your device partition table is write-protected. Use the Volume keys to select "Yes" and

: Navigate back to Settings > System > Developer Options . Toggle the switch for USB Debugging to enable terminal command transmission. Locate OEM Unlocking and toggle it to the active state.

(e.g., WP# on SPI flash chips) – ensure they are not pulled high.

: Navigate to Settings > System > Developer Options and switch on OEM Unlocking .