Go to Settings > System > Developer Options and enable OEM unlocking .
Download Android SDK Platform-Tools for Windows, Mac, or Linux. unlock-tool-loader
Open Command Prompt or PowerShell within the platform-tools folder. Go to Settings > System > Developer Options
Unlocking the bootloader will factory reset your device, erasing all internal data. Backup your data first. Warranty: This may void your device warranty. Security: Unlocking lowers device security. unlock-tool-loader