Upgrade jailbroken and unlocked iphone 3g (3.1.2 using blackra1n & blacksn0w) to iOS4

[xtrememac]

Hi,

I have a jailbreaked and unlocked iphone 3g (3.1.2) and have used blackra1n to jailbreak it, and blacksn0w to unlock it.

I have downloaded a lot of apps, both from cydia and the apple store.

So, I wonder how to upgrade my iPhone to iOS 4 without losing any data and apps at all.

Thanks,
xtrememac

 

[Applejuiced]

You will have to reinstall all your cydia apps again.
Some might not be compatible with iOS4.0 yet though.
You can use packagebackup to install them all at once after you're JB again but I would recommend installing them one by one to make sure they're updated and compatible with 4.0 If not then it could crash your phone and you'd have to restore and start over again.

 

[xtrememac]

You will have to reinstall all your cydia apps again.
Some might not be compatible with iOS4.0 yet though.
You can use packagebackup to install them all at once after you're JB again but I would recommend installing them one by one to make sure they're updated and compatible with 4.0 If not then it could crash your phone and you'd have to restore and start over again.

Thanks for the answer. Just wonder, is my iPhone going to run slower if i install iOS4? I heard rumors that it might