DAC USB Board should be 1.00. you mentioned that this port does not operate. I don’t think it is a USB driver issue . If you look at Mosaic Device screen DAC USB Audio Class should show USB class 1 or Class 2. even if there is no connection to the port. Can you see this?
Ahhh, right, apologies. I misunderstood 
Good question. I’d imagine it would be ok to jump straight to 2.11, but more appropriate for @James or someone from dCS to comment about going direct to the latest firmware.
Yes he can. I thought there had been a previous thread on this and James said in July '20
James had a typo there, 2.10 should read 2.11.
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Is this with the RS323 cable linking the units as your screenshot looks like the upsampler is only finding itself. Basically the screen in your shot should look similar to this:
Hi Pete,
Mine screen only shows the upsampler.
That’s why I think it lost the driver. Hope update to 2.11 will make some good changes.
I will keep my fingers crossed for you. You may be right as we do know that v.2.01 DAC and v.2.10 Upsampler cannot communicate according to the 2.11/2.10 release notes.
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Hi Pete,
After you replying. I did know that. Thank you so much for your help!
You are always helpful! 🫂