Unlike newer units that use "Px6" or "UIS7862" files, the YT9217B requires a specific .upd file placed on a USB drive. Without the correct UPD file, the unit will not flash.
Start your car or turn the key to the position so the stereo is powered on. yt9217b firmware update android 10 upd
Always try contacting the original seller on AliExpress or the car radio manufacturer first for the specific update. Unlike newer units that use "Px6" or "UIS7862"
This article will explain why, what “firmware update” really means for this device, how to safely update your existing system, and how to spot fake Android 10 ROMs. yt9217b firmware update android 10 upd
This article covers everything you need to know about finding, installing, and troubleshooting the YT9217B Android 10 update. ⚠️ Important Precautions Before Updating