Patched DSP (Digital Signal Processing) drivers to improve the thin sound quality typical of these units.
Because these units are generic, there is no "official" central website. The most reliable sources are: Search for "XY Auto" or "YT9213AJ" threads. yt9213aj firmware update patched
This is the "holy grail" for these units. Use a browser translator. Look for the "XY AUTO" mega-threads. Patched DSP (Digital Signal Processing) drivers to improve
You will likely need to re-map these in the "Wheel Study" app after the update. Conclusion yt9213aj firmware update patched
This occurs if the patched firmware has a different MCU configuration. You may need to go into Factory Settings (usually code 8888 or 1617) and adjust the Audio IC settings.