Help lease! How do i get iOS update

My iphone 3gs is jailbroken and i don't know if its ok to update it or not. I don't want my things to be deleted and i don't want the update to harm my phone cuz of the jailbreak. I suck at itunes and these things: S please help me, what should i do and how.

This is a tough one… I know that a jailbroken apple product is no onger apart of the apple terms and policies. Which means if you need it replaced, they won't. Lol but to update any apple product, if you have updated before, know you can just go under <settings> than go to <general> and there should be a little button that says <software update>. But if its not there than u probably need the update for it. To do that, plug in your iphone to your computer and connect it to itunes (it should do i when you open up itunes and log in). Btw you have to have the newest update for itunes, so do that before you update your apple product, or it won't work.once your iphone is connected to itunes, it should automatically ask you if you want to update your iphone to the newest software. If it doesn't when you look to the left, you will see whatever you named your iphone (ex: my iphone) when you click on that a bunch of options will appear.click on update software and you should be good. Again because your iphone is jailbroken this might not work as it isn't part of the terms and services thing. But you should try it first before all hope is lost.