An Authentication (Auth) File is a security certificate required by modern MediaTek (MTK) chipsets (from MT67xx series onward). It is used to bypass Secure Boot and SLT (Secure Loading Technology) when communicating with the phone via SP Flash Tool , Mi Flash Tool (for MTK) , or other flashing utilities.

The MT6785 is the model number for MediaTek’s Helio G90 and Helio G90T chipsets. These are powerful gaming-oriented processors found in popular devices like the Xiaomi Redmi Note 8 Pro , Realme 6/6 Pro , and Infinix Zero 8 .