unable to boot s/w mode on lg optimus vu II

[whizbee]

ive been trying to boot into s/w upgrade mode on lg optimus vu II,i was able to boot into the download mode using both vol. keys n power key, i want to manually boot the s/w mode as the lg update tool requests for it,any workaroud for this willl be appreciated,my fone is stuck at fastboot udc start............pls help is needed