iTunes cannot restore iPhone cause of incompatibility

Hello there,
Recently I have updated my iTunes and I now I have some difficulties to connect my iPhone. I know what my device isn’t eligible for the requested build and before the update it worked just fine. Now can anyone help me with this ? What should I do, in the future should I make the updates or stay with the current version ?
Thanks !

iTunes
iTunes could not restore iPhone “Andyc’s iPhone” because the backup was corrupt or not compatible with the iPhone is being restored.
