It there a dest-10.ini in OPT_P743TV1.0.0B09.zip? If so dId you put it inside the files folder of the FTM Flash Tools?
http://www.multiupload.com/YC8UN8AD77ro.build.version.release=2.3.5 ro.build.date=Tue Oct 18 01:07:57 CST 2011 ro.product.model=Optimus Monte Carlo ro.build.software_version=OPT_P743TV1.0.0B03 ro.build.sw_internal_version=OPT_P743TV1.0.0B09 ro.product.locale.language=pt ro.product.locale.region=PT
I have just flashed this with FTM Flash Tools and didn't get sim lock.
P.S.: Now I get the annoying message: "Your phone doesn't write MAC Address..."
As we expected to reflash by FTM flasher will cause the loss of MAC again, so you need to restore the modified QCN gain, mate.