Upgrading · Cydia

If you select Apple's Upgrade option your device will become unjailbroken.

Why: Apple's Upgrade process replaces all software on the primary partition and leaves only your data. All jailbroken programs are deleted.

3.1.3: Yes

3.1.2: Yes

3.0.1: Yes

Upgrade Help from BigBoss

3.1.2, 3.1.3 (2G unlock), 3.2 (iPad)

3.1.2, 3.1.3 (2G unlock) (no new 3GS)

3.1.2 (newer 3GS models tethered)

3.1.2 (but iPhone 3GS Issues)

3.0 (3GS Only)

2.2.1 (Obsolete)