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nrfgostudio & nrf51822

I bought two EZAIRO 7150 SL hybrid board, (which contains a MOTHERBOARD & DAUGHTERBOARD). As part of the problems we have been having trying to establish a wireless connection, we were told to update the radio firmware at the transmitter side (daughterboard). image description

Now in order to update the firmware on the nRF51822 attached to the daughterboard, we were asked to use the nRFgo studio and a JTAG adapter to establish a connection with the daughterboard. image description

Could anyone advice me on what JTAG adapter I would need to buy to connect to this daughterboard? I've attached picture of the motherboard, daughterboard and the circuit connections. I'm not sure which JTAG adapter I would need. image description

Thank you.

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