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After a full update, your head unit is a blank slate. You must restore functionality:

The process takes about . Do not turn off the car or touch the screen until it restarts. yt9216bj00012v001 update full

That would help reconstruct the full filename correctly. After a full update, your head unit is a blank slate

The yt9216bj00012v001 update pertains to a comprehensive overhaul or enhancement of an existing system, software, or product. The update aims to improve performance, security, and functionality. After a full update

: If your unit is functional, connect to Wi-Fi and navigate to Settings > System > System Upgrade to check for official cloud updates. USB Local Update