6.72 JB 5.05 games

Hi Guys

So i took the leap of faith and jumped from JB 5.05 and went to JB 6.72.

I had around 100 games on a external all 5.05 games which now don't work all there icons have a little exclamation mark in the corner. All 6.72 games newly installed work fine no issues and JB ing the system i found easy ... what can i do too get is the OLD games which used to run working NONE of them do anymore.

Any suggestions would be great.

Thank you