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Blinky Example Fails on MCB1700 using UART0

Hi,

i have a frustrating beginners problem... and hope you can help.

I bought an MCB1700 EVB from Keil and wanted to use the Blinky Demo as Base for my UART0 to UART1 Tunnel / Interface. The Blinky Example works fine as preset with UART1 but does not communicate if i set
Line 102: SER_init(1); to SER_init(0);

I added the required lines for UART2 and UART3 IO Pin Setup in the serial.c to test these but this results in a system stop and does even not work...

What do I wrong ? Maybe I have to add that I already removed the Jumpers required for In System Programming below the Display while testing UART0 on COM0 Connector.
So, the MCU does not change to reset or execute ISR when connecting to the COM0 Connector.
Much thanks for your support, Marcus