Default Tried to fix platform.xml on 4.4, screwed up

Guys, I screwed up.

I updated my Canadian S4 to 4.4 ( and since, my Titanium Backup could not access my SD Card. I tried modifying my platform.xml file to fix the problem, and since everytime I start my phone, everything force closes and I can't do anything.

I tried reflashing my 4.4 firmware (that was working fine before I touched the xml) but it won't fix the problem.

I didn't have a Nandroid backup.

What can I do?