can 5340 Audio DK Flash custom pcb?

Hello, I just jumped on the Nordic wagon to work with LE Audio. 

I have the 5340 Audio DK and a custom board with 5340. 

Not sure whats the process of flashing external chip. 

I've solder jumper withers to IMCU_SWDIO SWCLK and Reset. Which pins is for voltage reference? 

Do I need to cut a bridge on the dev board? 

Thank you! 

Rafal

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