If I jailbreak, will I lose all my app data?

[danetello]

I have got an iPhone 4 with firmware 4.2.1. If I jailbreak it and then restored from a backup, would I lose all my app settings/data like game saves, log in details etc?

 

[Benji222]

Unless you have shsh blobs saved from a prior firmware and want a stable system unlock there is no jailbreak for 4.2.1 so far

 

[Chad H]

I thought RedSn0w had a unlock for the iPhone4 running 4.2.1?

 

[Benji222]

An unlock is much different than a jailbreak.
Jailbreak opens the filesystem, unlock allows for different carriers.

There is a beta out but it requires shsh blobs for 4.2.1b which was a previously released version of 4.2.1.

There is a tethered verison out. Sorry for the misinformation.
I would just never use a tethered jailbreak!
http://www.redmondpie.com/jailbreak...g-ipad-ipod-touch-with-redsn0w-0.9.6b4-guide/

 

[j.dstasio]

Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_1 like Mac OS X; en-us) AppleWebKit/532.9 (KHTML, like Gecko) Version/4.0.5 Mobile/8B117 Safari/6531.22.7)

The latest Redsn0w will jailbreak your iPhone 4 without losing or resetting data. It is a tethered jailbreak. Meaning after a reboot or powering down your phone none of the jailbreak apps/ tweaks work until you hook it up to a computer and re-run Redsn0w. Works fine for some. More trouble than it's worth for others.

 

[danetello]

Ok I shall probably wait for the untethered jailbreak to come out. But when I do jailbreak it, would I lose all my application data like game-saves and high scores etc?

 

[JohnDoe98]

Ok I shall probably wait for the untethered jailbreak to come out. But when I do jailbreak it, would I lose all my application data like game-saves and high scores etc?

You shouldn't lose those.