[Q] [HALP] Phone bootlooping after a few secs topic

Weird stuff, I have an Xperia ZL C6602 (the LAM model). I tried to install an app that required me to reboot (I don't remember which one). So I did, and my phone has since then only booted to the lockscreen, black screen when I swipe it, and then it just reboots (if I sleep it it won't wake). I tried flashing stock LATAM 4.3 FTF, wiping of course, tried SUS, tried everything. I can't enter a recovery as I never rooted and I can't root because I can't use the thing. Of course official BL unlocking is out of the question. I am out of options. Read a good deal and I couldn't find a solution so I am asking you guys, I hope you can help. I find this extremely weird and I'm not a noob (been around rooting, ROM's and stuff since 2010). What is really strange is the fact that everything I flashed booted, but I couldn't get past the lockscreen on any firmware I tried.

Thank you very much,

Julian.