Guys, I screwed up.
I updated my Canadian S4 to 4.4 (http://forum.xda-developers.com/show....php?t=2678124
) 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?