Apple left his old devices in an dark room!!
they cant be updated upper thn 4.2.1
but know with the help of green poison u can jailbreak to get some good apps like facebook,temple run etc
know here we goes
1:-you need to find green poison ipa
2:-install in itunes
3:-crack with jailbreak
4:-reboot ur device
and its done
Thankyou regards:-nosherwan