Originally Posted by UPdownLoAD

I spent sometime last night with my friend's Venture, and tried everything that I had suggested with little luck.

However, I think I am making progress. I know that this command should/does work or is another variation of this command:

su
echo 1 > /sys/devices/virtual/usb_composite/diag/enable
To disable diag mode:
echo 0 > /sys/devices/virtual/usb_composite/diag/enable

In the /sys/devices/virtual/usb_composite/ directory, there are several folders, all of which contain an "enable" script:
adb
diag
modem
nmea
rmnet
rndis

I think that using the above command and changing diag out for one of the other folders may be the key. I haven't tried it yet though.

I do also recommend installing BOTH of the downloads discussed at the top of this page. Both programs install their own set of drivers which may prove useful when switching modes.