[AC Question]

AT&T flashed my ZTE Sonata worked for a week then it went black I have done a factory reset a master reset, But I still can not get it of the encryption unsuccessful, can I get it to work again where to I go to get the package downloaded that I need for this to happen,(I think AT&T should replace it with another phone they crashed it), anyway I have tried everything, and I am being told by cell phone repair places that its a lost cause yet I have watched videos on YouTube for correcting this for Samsung phones can my ZTE be repaired? I have been downgraded to a flip phone AT&T 3g SUCKS. Sassyred12