Hello!
I skimmed over the schematic and noticed that the power output from the
FTDI cable is connected directly to the 3.3V line. In my experience the
output from the FTDI cable is 5V even though it is the 3.3V version. I
have actually fried some designs due to this.
I'm not 100% sure about this, but my tips is to check it before you
connect it.
Best regards,
/Stefan