The key is not the model of the phone, but the version of the operating system. If it is iOS 8 or later, they are out of luck.
They claim to be out of luck.
There is no doubt in my mind that if Apple wanted to they could unlock that phone.
All that aside, I have not heard yet what would be the problem with Apple unlocking the phone and providing the data to the FBI. Too bad Timmy Kooke has never had any friends thrown off roofs or the heads cut off with a rusty knife.