I tested with the USB cable with PL2303 microchip, used 10kOm resistor & it worked very well. There is a problem that I dont have that cable & cant make a photo how to it was connected...sold it & changed to few original cables
Here is the photo how one website suggested to connect resistors (2x15kOhm) but it's no need. You can open the box in the midle of cable & plug, find what color is 2 pinout & 5 pinout, then connect that resistor 2 pinout to 5 in the box & test it. In *#06# more, find Acc: It should show plugged in: DCA510
About IR...try to download newer MPM version like 4.03 or 4.06 or just try this: open MPM, go to Settings, Connections...I think it will be selected to Automatic, so make Manual, chose COM port which uses IR, select again Automatic & Apply...now wait till MPM finds phone, ~10s as I remember.
Also IR problem can be related to mobile firmware, so I suggest also to upgrade to FW50