odin failing repeatedly

A

AC Question

hi guys desperate now !

so some time ago i rooted my phone then un rooted it, when i went to upgrade OTA a few days ago the phone said i had to do it through kies, tried that kies wont do so decided to flash the phone with a stock rom to remove any corruption, the flash succeeded with odin but the phone now simply shows a black screen no boot up just the words boot failed img too large in red. i have since tried god knows how many stock roms for odin to consistently fail or else succeeds but the phone still wont boot. fed up of waiting hours for these damn things to download only to find they dont bloody work. still able to enter recovery mode but thats as far as it goes. its a samsung galaxy s4 mini ( gt-i9195) any help appreciated...