ok, my turn to call for help
I've been getting same error, low voltage 4.2V (or 4.4, forgot)
however I have no problems reading the ROM/logging the car with deltadash/my old ECU was reflashed with ECUTEK many times - no problems at all
so it means that I have all wires in place (I have a swapped car, so wiring can be a real PITA)
I went in there today to check voltage and the only variation I saw was pin 9
this is what I observed:
test connectors disconnected/connected - 5V
test connectors disconnected/connected WITH openport cable connected to laptop - 9V (9.1~9.3V was jumping when I switched lights/AC)
does this mean this pin 9 is the one that I have to jump with 12V? I am unsure because I expected to see same reading on voltmeter as the flashecu shows me 4.4V