I have flashed my LG with the RPC1 firmware, it worked, though my experience might be a bit different from the rest... Before the flash process, I had dvd idle pro running, and I did not close it. I did close other apps like burning programs, NAV .. I even disconnected my network connection.
Flashing process with the rpc1 firmware is the same as the one using the official firmware. Everything went well and i rebooted. After the reboot, software like dvd info pro and alcohol 120 shows my LG as region free, but windows xp and dvd idle pro claims the drive is still rpc2, and i have 2 changes left!
Actually the problem was caused by the fact that i did not close dvd idle pro before flashing. After I closed down ALL my apps and rebooted again, this time, every single tool that i have, and winxp shows the drive as region free
I believe that it is safe to say that with the firmware and dvd idle pro, i have beaten all 3 portions of region protection... Haven't have time to do any test burns tho....