Every time I try to plug my phone into USB with the volume up button pressed (battery in or not) i get no feedback from my phone, and no s/w upgrade screen. I have also tried several usb cables and various ports on my computer, all unfortunately didnt work. I'm out of rocks to look under so I'm seeing if the great minds of XDA could shed some light on this confusing situation.
EDIT: I FINALLY entered software upgrade mode. I flashed the ICS u and x from lelus and then used fastboot to flash the stock LGMS769 recovery.img and then once i tried connecting my phone in software upgrade mode after putting batter back in it worked!