If you just received your NXP Rapid IoT prototyping kit (part number: SLN-RPK-NODE), it is fresh out of the factory. We just found out that some of the first units produced are not booting properly, so your kit may be affected
If your kit does not start, it can be fixed with a simple reset to factory default. Follow the “Wireless/KW41Z MCU firmware recovery” procedure: keep SW2 button pressed, while resetting the unit (push pin in reset hole on the back)
For further details, check page 107 of the Rapid IoT User’s Guide
Everything will be back to normal after that reset.
Have fun prototyping!