Navigate to Settings > System Info and tap the Android Upgrade button, which should become active once the USB is detected.

: If you need to access deeper menus after the update to fix a mirrored camera or button lights, common passwords for this model are Android 12 Head Unit Update (Tutorial!) 8 Mar 2025 —

The Russian forum 4PDA (via Google Translate) and XDA are the only reliable sources. Search for "AC8257 head unit" or "YT9216 custom firmware." Users post "pre-rooted" and "de-bloated" versions.

: If you need to access hidden developer settings to enable USB debugging or factory resets, common codes for these units include Local vs Online : Some versions have a System Update

Before attempting any update, you must gather specific information to ensure you don't destroy the device.