@TrivialSolution do you have a log you can share? Default should be 115200 but the bootloader runs at 1000000 so you may see some garbage characters on boot.
You may be better off experimenting with the at_client sample or similar since that’s an interactive firmware and supported in NFED. (Right now there’s no blinky_pwm in NFED, are you using the sample from vanilla Zephyr?)