Supported console modes are

Enter USB / UART console mode at netX

Select serial boot mode; RUN = High, RDY = Low

Provide a low level input signal to the RDY pin of the netX 50 to enter the serial boot mode during the powerup phase of the netX 50.

For details see section "2.3 System LED and Boot Options" in the following document.

Documentation

For an example description of the jumper on the development board NXHX 50-ETM, see the following document.

Documentation