cyanogenmod.org
Its basically a custom ROM (or os) for your phone but 10 times more awesome
- no bloatware
- fast
- visually pleasing. Looks allot better than stock ROMs. Its like nova launcher but build in
- you can still change the theme
- best autocorrect ever
- comes prerooted but you can enable/disable it in the settings
- latest android version. I think at least. My phone wouldn't update and this ROM came with the latest version so I installed this
- BUILD IN FLASHLIGHT. you know where you can turn on WiFi n stuff? You can turn on your flashlight there too!
- has flux thingy build in too which is awesome
You will most likely void warranty tough. Installing was a pain for me too because my phone is p outdated.
If you don't care about warranty. Install it now. Thats not a request, that's an order
Also you need to install google apps n stuff (like playstore) separately because legal stuff but that's p easy.