problems with online activation lg g3 ls990 please help topic

Hello, sorry for my English but I'm Hispanic
Live in Cuba and my brother who lives in united states sent me a g3 lg ls990, before taking the workshop that will unlock the GSM I restored to factory settings, and when you turn displays a screen looking online connection for activation , this screen is no way to get the phone because here we have no connection sprint to do so, I need if anyone knows how you can skip this screen to access the phone and get it unlocked, some trick or something? respond in English no matter I translate
Thank You