long ago I can downgrade to 4.0.1 but now? I can not. Why? How can I be sure I always can jailbreak in the future?
Firstly, don't update past 4.0.1, the last firmware JailbreakMe supports. Secondly, and arguably most importantly, allow Cydia to "make your life easier". This will allow you to always restore back to the latest firmware available when you select that option. |