No Debug Unit Device found

[VladChiNev]

Hi friend. I tried to make my bluePill board as CMSIS-DAP debug programmer for GD chips. I built Keil project. Downloaded it with ST-LINK Utility. And in devices I see the board now as:

And in Options for target project i set this:


It just doesn't see the board as the programmer:

But, sometimes if I don't set SWJ check box, it does show its Serial No and FW. But only once:

Only I close and open again this window, nothing works. Any ideas how to fix that? Thanks for any help.
But as the device Windows 10 says: All works fine.
I use: Keil V 5.36.0.0.
Windows 10.
STM discovery board (ST-Link) as the programmer for blue pill.