How did you do JB?

When you do Jailbreak, and install Cydia, the shsh is automatically backed up.

If you want to upgrade to iOS4.1 (never 4.2!), you can find from http://www.redmondpie.com/jailbreak-iphone-4-3gs-3g-on-ios-4-4.0.1-and-ipad-on-ios-3.2.1-with-jailbreakme/ alike to download the old iOS. But, you may need to find iTune 9.4 or 10.1, not the latest iTune for the same reason as iOS 4.2.

You MUST put your phone into DFU (direct firmware upgrade) mode in order to avoid iTune control! DFU can read any firmware, not the latest one Apple force on you.

http://limitededitioniphone.com/how-to-put-the-iphone-into-dfu-mode/

 

所有跟帖： 

• You are genius, wooddiy. Thanks a lot -tree20035- ♂ (0 bytes) () 01/28/2011 postreply 08:30:55

• wood大師:我需要去掉JB升級到4.1後再JB呢？ -tree20035- ♂ (30 bytes) () 01/28/2011 postreply 17:52:27

• 一旦你升級,理論上就有鎖了. -wooddiy- ♂ (139 bytes) () 01/29/2011 postreply 07:52:00