Hi, i am experiencing the same error as ELCID777 (fail after 6 seconds) but i was flashing LGP760_AP. extracted from V20B_00.kdz and using LGP760_20120911_LGFLASHv1350.dll.
I will retry with the bin provided in the link and ring a bell if it works for me.
Trying to flash LGP760AT-00-V10a-EUR-XXX-SEP-16-2012+0_AP.bin with LGP760_20120911_LGFLASHv1350.dll
I get the error in the attachment.
Can it be something involving a locked bootloader?
When i rebooted the phone i saw android installing and now the phone is stuck at lg logo, but without any security error message.
it works flashing also the fls