Go to Settings > System > About Device .
Select System Update or Online Upgrade . If a newer version of YT9216BJ00012V001 is available, a "Download" button will appear.
Sometimes a "system update" isn't needed; only the core apps require refreshing.
To update your (specifically version YT9216BJ00012V001 ) Android head unit, you typically have two main options: an online system upgrade via Wi-Fi or a manual USB firmware installation . This specific build number is common in Chinese-manufactured car stereos based on the MTK8227L chipset. Method 1: Online System Update (OTA)