Internal RTC with back up battery

Transistorfips:
Hi, please look at the DUE schematic. There you find that Master-Reset is connected to the 16U2 which produces the reset pulse when reseting or during power-up sequence (DUE: Pin 47, NRSTB <-- MASTER-RESET--> 16U2: PC7, RESET_CMD) which take place during toggling power.

Bummer, there are really so little soldering jumpers for additional configuration on the board. I also think about how to use VDDBU.

So may i need to broke 16u2 pc7 connection?