This firmware is only for MX5 and is NOT applicable to any other models. If this firmware is flashed to other models, it will immediately cause the product to be unusable and unable to repair by yourself. If the firmware of your MX5 is already V1.04, then your MX5 needn't this update.
The firmware version of your MX5 could be check at this tool.
What's updated:
Fixed an issue where there would be no output when driving low-load speakers in rare cases.
Firmware and tools for Windows: Download here (Firmware and tools for Windows: Download here (This update requires a Windows 10 or higher OS with driver installed. Drivers could be download here).
Firmware and tools for MAC: Download here
If you have questions about the update of your MX5, please contact us before updating this firmware.