UART in nrf52832

Hi I am using  UART code from nRF5_SDK_16.0.0_98a08e2\examples\peripheral.

I have checked loop back with default UART pins,which are 5,6,7,8.

Now I want to interface some sensor (Hardwired ) with this PCA10040 DK. Hence I read on Nordic community that I have to use different GPIOs.

I have changed 5,6,7,8 to 28,29,30,31 and 19,20,22,23 but in both cases loop back did not work.(I did not get data on serial port).

What am I doing wrong ? Please help

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