Hi Drons, just trying to follow your wiring, have I got this right?
1. Boot0 and Boot1 shorted out with lead going to 3.3V on P3P board.
2. Lead from 3.3V on USB to TTL FT232RL board to 3.3V on P3P board.
3. Lead from 5V on USB to TTL FT232RL board to 5V on P3P board.
I think I'm ok with the...