To use these files, you generally follow this workflow in SP Flash Tool : Open SP Flash Tool as an administrator. Load Files:
Hovatek is a legendary resource for MTK flashing. They maintain sections for "DA Auth files for MTK". Check their "Android Boxes & Tools" section. Infinix MTK DA Auth File
(e.g., X6853) of your Infinix phone so I can help you find the specific file? To use these files, you generally follow this