[Q] p5100 no sim, no gps connection please help (radio) topic

Hi, i want to ask for your help with my galaxy tab 2 10.1", it doesn't connect to sim network, neither GPS, i know it has GPS, but don't work, i think is a RADIO or MODEM trouble, i tried installing original Stock ROM from Chile (4.1.2) there isn't 4.0.3, i cant found it over the web, i don't want to send it to a repair service because everyone lies and u have to pay a lot, please heelp!