Do not just copy/paste the file. You must "burn" the image to the SD card.
If your Fa4 is currently running firmware version or lower, the F.audio Fa4 Firmware -FREE- update is not optional—it is essential. The jump from v1.5 to v2.1 represents a complete re-write of the audio HAL (Hardware Abstraction Layer). F.audio Fa4 Firmware -FREE-
F.audio doesn't always have a flashy English website, which makes finding updates tricky. Here are the most reliable sources: Do not just copy/paste the file
Many users are stuck with buggy stock firmware from 2022, suffering from slow UI response, Bluetooth dropouts, or limited format support. This article is your definitive resource for finding, installing, and optimizing the upgrade to breathe new life into your device. suffering from slow UI response