This firmware is only for DX7 Pro+ 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 DX7 Pro+ is already V1.90, then your DX7 Pro+ needn't this update.
The firmware version of your DX7 Pro+ could be check at this tool.
What's updated:
Fixed occasional pop sound when input DSD by IIS
Added S/PDIF compatibility option
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 DX7 Pro+, please contact us before updating this firmware.