LG optimus G pro F240 (from china)

[mumblebee62]

Not sure if you guys can help here..i got this phone from china but have had issues with network signal eg no sim installed, emergency calls only..did some digging on net and found its a common problem with the phone from china... now question if i used a custom rom would this sort this problem out? mt phone now wont pick any sim up i did to start with but the signal was hit n miss...tryed reset etc but that makes no difference..not sure what else to do...if i can use a custom rom which is the best to use please..thanks x