Months?!
Looks like you just need to reboot into recovery, do a full wipe and flash a new rom.
It looks like you don't have a usable OS, so you'll either have to flash a new ROM in Recovery, and if that doesn't work, go into your bootloader and use ADB to push it (you'll have to use a guide for that)
Yeah, it's been like this since a long time. I was too lazy, and I used another phone.
So, what should I do?

What's a ROM and Recovery?
Now the whole story behind why my phone got fucked up is:
I was updating the phone, and when it finished updating, the application running on the PC, said that I should remove the USB from the PC, then turn off the mobile, turn it on again and plug the USB, and while doing that press the back button while holding the turn on one. I did that and my phone got fucked up.
It's under warranty, but I didn't want to let others fix it, coz I thought they would be stupid and delete everything. So, I decided to do it myself.