Hi NXP Community,
I’m working with the FRDM-MCXN947 board and encountered a blocking issue after flashing a minimal diagnostic binary using MCUXpresso IDE. The binary was designed to initialize UART for physical validation, but after flashing it, I lost SWD access entirely. The debug console now consistently shows:
EE42: Could not connect to core.
The board still shows physical activity (e.g., LED toggling), so it’s not bricked. However, I can no longer connect via SWD, and all recovery attempts (power cycle, reconnect, etc.) have failed.
I suspect the binary reconfigured UART or clock settings in a way that disabled debug access. No ISP was used—just a standard debug flash via MCUXpresso.
I’ve experienced a similar issue before with an LPC1769, where the solution was to reset or reflash the bootloader, which successfully restored SWD access. I believe the same approach might work here, but I haven’t found any documentation or procedure for safely resetting the bootloader on the FRDM-MCXN947.
I’d appreciate any guidance from the community or NXP engineers:
- Is there a known recovery method for this board?
- How can I safely reset or reflash the bootloader?
- Are there vector catch or jumper-based mechanisms available for this family?
Any help would be greatly appreciated.
Thanks
