Updating ipad 2 model A1395 from ios 6.1 to ios 7.1.2 firmware incompatible error

Hello everybody... i'm trying to update my ipad 2 wifi model A1395 from ios 6.1 to ios 7.1.2 using this firmware from iClarified: ipad2,1_7.1.2_11D257_Restore.ipsw which is the correct firmware..but itunes says it an incompatible firmware i downloaded latest itunes and everything i need but it still doesnt work... dont know what to do...plss if someone can help thanks in advance..