Then I took a advice from a friend whom is also Triumph trained tech staff working for Triumph Taiwan, disconnect battery from bike, then turn-on ignition for 1 min, then off for 1 min, as this is one of off the book procedure they use when Triumph's diagnostic tool fail to download, this method supposedly will drain ECU Power and cause it to going to mode/state that will accept recovery download.
Then I begin to test with new cable no.3 (same supplier, same chipset, I just buy extra cable just in case if one does not work) + new installed of TuneECU 2.5 loaded with tune read from bike before (20446) - once connected, almost immediately the box appear “ECU is connected but not Responding, Run the Recovery?” Once recovery mode completed download 20446 Tune into ECU, the bike started up again no problem. I then process with tune download 20507 (Aftermarket muffler Tune) with no problem at all.