I installed a cool tweak the other day called "Light Bright". Kind of a dumb name but a cool tweak. It made it so that you could adjust screen brightness anywhere without having to access a menu or anything. You simply toggle the volume keys while holding down the home key. Pretty cool! Until my phone went into a boot loop. I was able to SSH into my phone during the boot loop and remove the dlyb associated with the tweak and my phone booted perfectly after that! I've emailed the dev. If they fix it I'll let you know. Otherwise, STAY AWAY!