QPST doesn't detect G2 D800

I'm trying to follow this guide to enable extra LTE band on my g2 d800.

Through hidden menu 3845#*800# I have set port settings -> Diag Setting -> USB
Also I've enabled Hardware key mode (all three back button on powering on -> Mode on)

However, QPST is unable to see my phone. I have to disable Show serial and USB /QC diagnostic port only to see the phone modem port. Also even after doing that and adding it, qpst doesn't detect phone

Any ideas of what might be causing it ? I'm using Windows 7 64-Bit as OS and Cloudy 3.3 w/ dorimanx 4.6 kernel and USB mode set to MTP

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Does G900a or G870a work in USB Diag Mode for QPST?

Does the G900a and/or G870a work in diagnostic mode for QPST, or does the locked bootloader prevent this?

I'm trying to test turning on the Tmobile LTE and the extra GSM channels on a G870a but device is not recognized by the computer as soon as I switch to rndis + dm + modem + adb.

Official Samsung USB drivers, debugging enabled, standard reinstallation tricks and such already tried. What am I overlooking? Used the right cable too...

Or is this just a non-starter from the bootloader?

Thanks!