What will happen if I restore my Jailbroken iPhone 3gs?

A friend of mine found this iPhone brand new in the box… Don't ask. When we found it we were unsure as to what network the phone was locked to so I was advised to get it Jailbroken, not knowing anything about iPhones I did so. It's an iPhone 3GS and the iOS currently running on the phone is 4.0.2 I'm aware this is really old software but it didn't bother me until recently when I realised that barely any of the apps I would primarily use will operate with software like mine. What can I do to update or get my apps working correctly again? I don't even use any of the Jailbreak features is it necessary to have it Jailbroken?
S x

If you do restore and update the software, the jailbroken software will be gone, so you will have to re-install it. But before you update the software I would back up the iPhone so you don't loose any of the data from the phone. I'm not aware at the time of any iOS 6.0.1 jailbreaks but I know that there are many iOS 6.0 jailbreaks for the iPhone 3GS such as RedSn0w, GreenPoisi0n, Ultrasn0w and Blackra1n

The jailbreak will be gone and you need re jailbreak it.

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