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TM4C1294NCPDT: After flashing it with UniFlash the USB communication is not working

Part Number: TM4C1294NCPDT
Other Parts Discussed in Thread: UNIFLASH,

Hello,

Before I started to flash my device with UniFlash I always used CCS to flash my devices. And that way I had no problems with my device.

Now I tried using Cloud UniFlash and tried to flash my device which has a TM4C1294NCPDT on it. The flashing tool that I used is XDS200 . First I flashed the device with hex file which i got from the CCS, the device did not start. After this I flashed the out file which the CCS generated, this time everything worked just fine  only when I connected the device top my PC via USB, I could not read data from it and some information ware missing in the USB device description. When I read the USB description data I get this massage :

" Bus 001 Device 009: ID 1cbe:000a Luminary Micro Inc. Couldn't open device, some information will be missing "   ***

After this I was thinking if I reflash my device with CCS everything will be okk but no, I get the same massage which i quoted. 

After that I tried another board which had working firmware on it and the USB data sending was working, but this time I only read some registers like MAC address and device info, this was enough to render this bord useless.

Thanks for helping

Robert