Upgrade not happening for me- several times I've run it and get TUSBAUDIO_GetDfuStatus: Function failed with error code 0xEF000004.
Im missing something, clearly.
Did you follow the steps in the downloaded folder?
Only the Windows version PC can be used for updating.
1. Connect the M500 to the PC with the SMSL USB driver installed with a USB cable and turn on the power.
2. Click "XMOSUSBDACDfu.exe" in the DFU tool folder.
3. Click "Browse ..." on the right.
4. Select "SMSL_M500_DFU_2.01.bin" in the downloaded M500 2.01 USB firmware folder.
5. "SMSL_M500_DFU_2.01.bin" is put in the box of "Firmware".
6. Click "Start" at the bottom right.