Loading a new uc5550

I am trying to load a several new uc5550 with our software. I successfully loaded the bootloader and the firmware. But using tinyclr config, trying to connect with the uc5550-uc5550 it responds with ‘connection failed.’ Occasionally, it does connect properly and I am able to load the software image from the .tca file. I don’t know what is happening. Also, trying to load any software from VS also fails.

. Any thoughts ???

So these modules load if you place them in our dev board?

This was already using the UCM Dev. (uc5550, ucm Dev, ud700). I did have some peripherals attached: CAN with active traffic, SD card inserted. When I removed the SD card, everything worked OK.