Customized nrf5340 board, firmware writes to chip with no response

[cweib]

I was able to run blinky successfully on my customized nrf5340 board, but it doesn't respond to writing matter related code, there is no output from the RTT, I refer to the design of the nrf5340dk, which contains a high-frequency crystal and a low-frequency crystal as well as an external flash, which is designed according to the design of the nrf5340dk, using the The same qspi pins and the same type of flash, but it doesn't respond, the firmware is determined to be working fine on the nrf5340dk, but it's having problems with my customized boards

Here is the part of my schematic if the DCCH does not make any connections in normal mode

[Jared]

Hi,

Are you using a module? Where is the High frequency crystal? I see that you don't have a low frequency crystal, have you modified the nRF5340 to use the internal RC oscillator instead?

regards

Jared