SMSL SU-X FW Upgrade

[mikolajek]

Has anyone sucessfully upgraded their SU-X to FW 2.1 offered on the manufacturer's site? I'm trying to do so, following the instructions outlined in the attached PDF file, but I cannot succeed.

After I install the WCID driver and power up the DAC in the upgrade mode, I run the batch file (load.bat) but keep getting the message "AllWinner UAB FEL device not found!"

The PDF instruction says "connect the DAC to the computer via USB mini cable", but the DAC has no USB mini input port! :O I tried to upgrade it via the USB-B port and USB-C port and each time I see the same error.

Can anyone help, please?

 

[mikolajek]

@SMSL-Mandy, will you be able to help here?

I'm also wondering if I may already have MCU 2.1 on board. My device was received in May 2025, and I understand the upgrade file is dated for September 2024. Not sure how to check it, I don't see a menu option allowing for this.

 

[hxcn]

I just managed to get my SU-X upgraded sucessfully and you can check your firmware version on reset page.
The official guide is also not working for me.
1. After connect the dac with USB-B and power on the dac when holding the knob (a red light on without any screen display), you will find some sort of unknowning device in device manager.
2. Open the zadig-2.8.exe and goto Options -> List All Devices then you will find lot's of connected usb devices listed there, select the "unknowning device" in step 1 and choose and click "install wcid driver" then wait for the installation to complete.
3. Execute the load.bat and wait for the upgrade to complete

I tried many ways to get this upgrade working so I don't remember the steps clearly, maybe reboot between step 1 and step 2. You have to make sure this "unknowning device" have wcid driver installed before step 3 and you can check this in device manager.