All apps reversing to home screen/home screen cycles constantly

A

AC Question

Hi All. I have a S3 korean version SHV E210S initially running 4.0.4. After six months of use, WIFI kept dropping even when next to the router so I upgraded to 4.4.4
This was a bad idea and all apps were freezing and not working. So i tried to downgrade to 4.1.2 but it didnt work (magic string missing and unsupported version error on ODIN). I managed to flash 4.3 but now NO app works, even going to settings, the phone reverses to homescreen as if someone was pressing the back key. As soon as i touch an app, it flashes open and closes.
Left on its own, it cycles through all the screens constantly. Is this a hardware fault? How do I check?
 

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