custom board

Hlo

I have to asked that i am  working with custom board of nrf5340 and i want to flash and check the rf signal by flashing through the nrf5340 development board and i am not able to flash the board .  and if i flashed only my custom board with external jtag then after flashing if i checked the signal in nrf connect  for desktop then there shows an error .

so can you sugggest, how should i resolve this problem

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