My ADuCM320iQSPZ cannot load fimware after loading my code

Hello:

       I buy ADuCM320iQSPZ Eva board, I used the J-link OB emulator to upgrade example Firmware to the Eva board, it works good.

      But after I download my firmware, which I used UART pin(P1.0 and P1.1), the J-link OB emulator does not work any more, I guess I used these two IO which is used by J-link OB emulator lead to this issue, But I do not know how to erase the Flash and reload the Fw, please kindly help to fix this issue, thanks.