What is TATSU?
I am trying to restore my old iPhone 5C, and iTunes denies me with the explanation "TATSU". The other day, I was trying to restore an iPhone 6, and I also was denied by iTunes with the same "TATSU". I had to take it to an Apple store to get it restored. I asked the Apple Genius what TATUS meant and he had no idea. Apple online says to go into your Terminal and look for "gs.apple"...I did that, but the Genius said I never should have, and Apple online should not be telling people to go into Terminal. Can someone tell me how to fix this without going into an Apple store again.
MacBook, Mac OS X (10.5), other computer is a PC