Default [Help] can't flash ROM past 4.1.2

I'm pretty sure flashing a stock ROM will fix this but as my download of the huge stock ROM failed after over an hour I thought I would ask.

So I have been running stock CM10.1 for a long time and thought I would update to kitkat, really want to try ART.

But any ROM I flash that is over 4.1.2 does not boot, tried twrp and clockwork. Done a complete format from recovery of all partitions, and waited over 5 mins for it to boot first time.

But when I flash CM10.1 phone works fine.... Really annoying me now.

Any ideas before I start downloading the epic Samsung files again?

Sent from my GT-I9300 using Tapatalk

Sent from my GT-I9300 using Tapatalk