uprooted S4 possibly incorrectly, help please!

[xuiton]

after following these instructions to the letter my phone now is slow and freezes constantly, the keyboard will not work and I get this message popping up every 10 seconds "unfortunately samsung keyboard has stopped working". Basically the phone is unusable now.

wwwgalaxys4root.com/galaxy-s4-tutorials/how-to-unroot-galaxy-s4-and-remove-root-completely/

I did this unroot and then factory reset.

using S4 international GT-I9095 with O2 UK

the stock I installed does look different from when I got it though.

Thanks.