Hi Vitaliy,
Your problem sounds somewhat similar to a problem I previously had, and below is the copy of my posting that documents my solution.
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Thought I should close this post with the procedure that eventually worked great for me.? I posted this in a different post/thread but thought it might help others in the future that stumble upon this post/thread.
Sorry about the graphics not showing up in my post, and I believe you can find the graphics showing this in post #5577 by Steven Reed, and below is the process I used based on Steven Reeds graphics.
What finally worked for me is as follows.
I used device manager to see what device my TinySA was showing up as with my TinySA connected to my computers USB port and when I then selected the DFU mode on the TinySA.? In my case my device showed up under "Other devices, and under that it said STM BOOTLOADER"? Then using device manager I right clicked on "STM BOOTLOADER" and selected "Update driver", then I selected "Browse my computer for drivers", and then I gave it the following path for the search "C:\Program Files (x86)\STMicroelectronics" and told it to include subfolders for the search.? Windows then successfully found the correct deriver and then DfuSe Demo had no problem recognizing my TinySA when I put the TinySA in DFU mode and I was then able to update the firmware in my TinySA using DfuSe Demo.
The above procedure worked great, whereas everything else I tried failed.
Don (wd8dsb)
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Don
