Did Apple stop signing iOS 7.1.2?

I recently unlocked an AT&T iPhone through AT&T customer service rand connected it tot mobile and when I tried to do a full restore to update to iOS 7.1.2 it said software invalid and I already installed the latest iTunes and I download the update through iTunes and online and didn't work. So did they stop signing that version or is it that unlocked iPhones can't update?

Most likely just a failed download, I've had that a few times. It took 4 - 5 attempts on one update.

Restart itunes & try it again.

Unlocked phones definitely update OK.

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