Check:
If it’s not a major brand, firmware updates may not be available at all.
A: Yes. You will need to reconfigure the digital filter and gain settings after the update. faudio fa4 firmware upd
DFU (Device Firmware Update) mode is a special state that allows rewriting the firmware.
Total time: ~4 minutes.
Do not skip these steps.
Recommendation: If you are using a faudio fa4 firmware upd from before 2024, upgrade to v1.2.4 immediately. Check:
A: No. The updater requires Windows. Android does not support flashing the FA4’s internal controller.