This usually means the resolution of the firmware didn't match your screen. You will need to "blind flash" the correct resolution firmware.
Have questions? Drop your MCU version in the comments below for specific file requests. yt9218c firmware update
Because YT9218C units (often 8227L platform) vary by manufacturer and hardware configuration (like screen size and CANBUS), it is critical to use firmware specifically for your model to avoid "bricking" the unit. This usually means the resolution of the firmware
: Often listed as Android 9 or 10 (though some units may "fake" higher versions). 2. Where to Download Firmware yt9218c firmware update
Do not download random "YT9218C firmware" from Google Drive links found in YouTube comments—those are often malware or corrupted.