Dude I've been having trouble trying to figure this one out for a week now!! When I finally decided to take the plunge and ask for help, there just so happens to be someone else in the same half sunken crad as me! I think I've hit about all 6 billion corners of the web trying to figure this out, and am at the end of my fuse. Here's what I have tried so far with no success, which of course includes all that you have done 5X over as well.
Did everything without root, then decided maybe I need root, so did it all again with root after superoneclick.
1. YES drivers, drivers, and different drivers including one recommended HTC modem driver. And yes made sure there were no conflicts rebooting a little short of a hundred times so uninstall reinstalls were clean.
1.1 YES tried the next of obvious things which was 3 different LG cables and even a Samsung cable.
I am simply trying to get a reading with DFS, CDMAWS, QPST...... So far I get a partial DFS 3 lines blinking red but worthless. Response from above s/w's is that this thing is already in diagmode...
other things I have tried by guessing and/ or read surfing web that have not worked for me include:
*power must be off
*usb modem driver must be disabled (win 7 64 gives a popup requiring a restart when this is done for some reason)
*fastboot mode (tested with DManager too)
*dl mode ('')
*ussd codes (pound star codes, my bad if they aren't called ussd)
*double checked all baud rates and changed com ports
*tried all diag modes ie. Qualcomm, LG, WCDM and whatever else in s/w's (DFS reply is that phone already is in diag
*QXDM - downloaded and tried as well
*LGPST - Yup tried this too - **However there was something I read in the depths of the web that said they lock tighted this phone so hardcore that LGPST must be used in conjuction with a particular dll that must be sought after. After installed and dll file d/l'd it was said to use LGPST to send dll to phone, which will in turn unlock the mfg "chastity belt" I am calling it now. Don't want to brick this thing so held off. But my warranty days are getting closer so... will advise.
*UNICDMA, CDMATOOL -- negative results for me
*playstore MSL apps - everyone I could find followed by an Alogcat search filter of MSL returned jack nothing
*the proclaim getprop ril.msl not work either.
Think im getting desperate yet guys? I'm not sure how much longer I can refrain from having an lg 38c android sized hole in my drywall, so im at a standstill for the time being. I feel I'm getting close to the level of needing professional help from the person that has you lay on a couch and talk for having taken things this far.