guide also works on 3GS
get legacy ios kit
open legacy ios kit, go to 'Restore/Downgrade' and then 'Latest iOS' and follow the instructions.
select "Download Target IPSW" and it will download the IPSW.
when it asks for "jailbreak option" select "yes when it asks for "memory option for creating custom ipsw" select "yes" (if you have low ram select no) when it asks for "pwnDFU/kDFU mode option" select "pwnDFU" when it asks for "send device to recovery mode" select "yes" at this point, it will ask you if you wana enable "DFU mode helper", select "yes" and follow the instructions, let the device be untill it finishes.go through setup (you have to have a working wifi network) and DONT sign in with your apple id.
if you see cydia on the home screen (have to swipe right), congrats your device is jailbroken, open it.
should say this now
when the app closes re open it
open this link in safari on your phone (need to find link again lol)
re open cydia and it should work
now you can install apps through cydia, but to get real ios apps we need to get appsync (we already have it but from my experince it has issues)
in cydia, go to sources
click edit in the top right corner
click add
type "yzu.moe/dev" and press enter
a repo called "Electimon's Repo" appears, click it.
go to "All Packages"
press "AppSync Unified"
go home and open safari
go to mtmdev.org/webapp and click "iOS 5" (press iOS 6 if your on iOS 6)
scroll and press "google chrome"
wait for it to finish, open it
you now have chrome installed, go back to mtmdev.org/webapp and press the home icon, you can install any app from ios 4 and (or 6)