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MediaTek devices require a Secure Download Agent to pass secure boot checks. If you are using the default MTK_AllInOne_DA.bin file, it might not support your MT67 device version.

In the SP Flash Tool interface, click on the Download Agent tab. Instead of using the default MTK_AllInOne_DA.bin , try navigating to the folder containing your firmware and selecting a DA file provided by the manufacturer (often named DA_SWSEC.bin or similar). 3. Use an MTK Authentication File (.auth)