Jailbreaking Opens your device to non apple developers and allows you to modify almost every aspect of the device. In other words it let's you do things you normally can't do, such as: getting themes, getting paid for apps for free, getting apps that the app store has blocked, and much much more!
I tried to download vlc player but i seems to update my software 4.0, if update the sofyware means my itunes may lock bcoz this was china mob my uncle used this mob there when i got this my mob in my i need to unlock the mobile and the shop keeper said dont update the software if u do ur software will lock..
So tell me wat to do