Failed -remote 39-flashing Lock Flag Is Locked. Please Unlock It First 39-- [exclusive]

: Once OEM Unlocking is enabled, reboot the device into Fastboot mode and use one of the standard unlock commands: fastboot flashing unlock (Standard for newer devices) fastboot oem unlock (Common for older models)

Type fastboot devices and verify your device's serial number appears. : Once OEM Unlocking is enabled, reboot the

The numbers flanking the error message are OEM-specific error codes (most commonly seen on devices utilizing MediaTek, Spreadtrum/Unisoc, or specific Xiaomi/POCO/Realme architectures). They point directly to a hardware-level restriction preventing partition modification. Root Causes of the Error Root Causes of the Error : In your

: In your device's Settings > Developer Options , you must toggle on OEM Unlocking . If this option is greyed out, your device may be carrier-locked or require an internet connection to "check in" with the manufacturer's servers. It occurs during the process of trying to

This is by far the most common context where users find this error. It occurs during the process of trying to or flash a custom recovery (like TWRP) or a new ROM . The typical workflow involves a computer communicating with an Android device via the fastboot protocol, a standard tool for low-level device modifications.