Back up old iphone up to date sofware to new x
Saying backup is corrupt, wont let me back up or tranfer my info to new iphone x .. how do i fix this problem!?
Same thing happened to me. I updated iOS to 11.1 on the new X and then the X accepted the backup from a 6S. I did not delete the other backup, or re-backup the 6S. This was not a seamless transfer by any means, and I have had just about every iteration of the iPhone from the first one.