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CCS/EK-TM4C123GXL: Error Connecting Target after using UART3

Part Number: EK-TM4C123GXL
Other Parts Discussed in Thread: UNIFLASH, LMFLASHPROGRAMMER, TM4C123GH6PM

Tool/software: Code Composer Studio

Hello Friends,

I've got a big problem. I work with a TM4C123GXL for a project and have be done next week. Now my UART Port changes from UART1 to UART3. In the moment I flash the programm on the board there send something in UART3, but after it i can't connect any more to the board. Not with CSS and also not with LMFlashProgrammer or UniFlash. 

There is every time the response: CORTEX_M4_0: Error connecting to the target

I see the board in the device manager. (look below) It's still send a message on PC7 over UART3.

After the first time I get the same board from a friend of mine. I flashed it and it's still the same problem. 

Maybe It's because I use the header: #include <LM4F120H5QR.h>
and not: #include <tm4c123gh6pm.h>

I've got some problems with the second one and google told me that I also can use the first one.

So do you know if there is a possibility to make a factory reset without erase the memory with UniFlash etc. Because it's doesn't work. :(

Please Help!