mobile

Whenever I used to try to update my phone from 4.4.2 to 4.4.4, my phone would say the installation was interrupted, and kies would say my firmware is up to date. At the time I didnt care much, but now that 5.0 is out, I want to figure this out. When I got my phone in September I flashed the original software to root, then reflashed 4.4.2. Since then I unrooted and restores my phone to try and resolve the problem, but neither have helped. Does anyone know a solution? If any more information is needed I can definitely provide it.