Updating the F.Audio FA4 firmware is a common way to resolve audio bugs, such as "crackling" at high volumes, and to improve system stability. Because F.Audio is a niche brand, official support pages are often in Chinese, and many users rely on community-shared links and mirrors. Latest Firmware Version As of early 2025, the latest reported version is V9.21 (released February 8, 2025) , specifically for devices with the serial number. An earlier stable community favorite is Update Instructions Check Serial Number:
Initiate Update: Place the file in the root directory of the SD card, insert it into the faudio fa4 firmware upd
Resolves the "crackling" or "krek2" noise issues encountered at volumes above 70. Sound Tuning: Updating the F
Go to the official FAudio download portal (search for "FAudio support FA4 firmware"). Avoid third-party sites. Download: An earlier stable community favorite is Update Instructions