Firmware recovering method using reset pin of nrf52820

[Heart]

Hello
I'm going to recover firmware of dongle(nrf52820). But there isn't reset button in dongle. Because the nrf52820 is too small I think.
So how can I do and which pin I have to select to reset?
Tell me about method in more detail.
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[Turbo J]

Your wording is really bad. One can (try to) read firmware or recover flash (which means erasing it) - your sentence is a mixture of both and thus very easy to misunderstand. That AI translation?

You would probably need VCC, GND, the SWD lines and RESET.

[Heart]

Sorry, my English writing ability is poor.
Tell me about this method in more detail.
Thanks