If you can't achieve success, to understand what's wrong, you should follow the LED blinking explanation below:
1) LED blinks two times SHORT, then SHORT:
.....##...##...................##............
this behaviour means all checks were passed, but console have failed to start.
commonly happens when the pulse length is too large, or the timing value is too low
2) LED blinks two times SHORT, then LONG:
.....##...##...................##############
this one means checks failure. Too large timing, or too short pulse length
Segnalibri