Some users of Musca-A development boards have experienced problems with the boards after dragging and dropping applications that use the security features. Further drag and drop to the board would not work, and the board could become unresponsive.
The reason for this issue was that once the secure settings had been set up by the application, the DAPLink firmware was unable to access the memory system. So subsequent drag and drop would fail.
New firmware has now been released in which the DAPLink sets the reset vector to run from SRAM and then does a hard reset to stop the core setting any security features during drag and drop.
The new firmware, and instructions on how to install it, can be found on the Musca-A firmware page.