If your device displays or fails to unlock despite following guides, your bootloader is effectively locked for good unless an exploit is released for your exact model and bootloader version. For development, consider buying an international Exynos model or a Pixel device instead.
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OEM Unlocking is disabled in Android settings, or blocked by a carrier profile. If your device displays or fails to unlock
The Digital Gatekeeper: A Perspective on Bootloader Security se bootloader unlocking relocking 1662 patched
