Power off the phone. Hold the Volume Up button while connecting it to your PC via USB to ensure it is detected in "Flash Mode".
An auth file (typically with a .auth extension) is a security certificate used by MediaTek's flashing protocols to verify that the person attempting to write data to the device is authorized. tecno in5 auth file
After a factory reset without the previous Google account credentials, the phone becomes locked. While some methods use test points or OTG cables, the most reliable method requires flashing a patched preloader or custom recovery—both need an to write to the protected bootloader region. Power off the phone
A yellow progress bar → Red bar (download agent) → Purple bar (authentication) → Green checkmark. tecno in5 auth file