Hi all, hope that my solution help someone. First DFU mode, reinstal with iTunes 3.1.2 firmw. Download Blackra1n, remove Sim from phone than JB it with Blackra1n. After JB instal only Snow not Cydia, reboot the iPhone and wifi is OK put the sim in the phone and unlock work fine. Reboot again and wifi works OK After Cydia install and rebooting everything work fine
Sorry for my bad english but I'm from Italy