Hi people, I'm sorry if I sound quite new to this, it is my first time jailbreaking my iPhone. I'd like to know, how can I safely update my current 4.2.1 jailbreak, which is a tethered jailbreak, into the yet-to-be-released untethered jailbreak?

Do I need to do a complete restore of my iPhone, including setting up of a new phone in order for the jailbreak to be 100% safe? Or can I just restore from backup and then jailbreak it?

Thanks people.

Originally Posted by jianlun26

Hi people, I'm sorry if I sound quite new to this, it is my first time jailbreaking my iPhone. I'd like to know, how can I safely update my current 4.2.1 jailbreak, which is a tethered jailbreak, into the yet-to-be-released untethered jailbreak?

Do I need to do a complete restore of my iPhone, including setting up of a new phone in order for the jailbreak to be 100% safe? Or can I just restore from backup and then jailbreak it?

The actual details of the untethered jailbreak haven't been finalised yet. I don't have any information on this.

the only post that has been made on the topic is from chpwn and that stated you would need to do a complete restore of the phone to go from the interim tethered jailbreak to untethered.

It is always not advised to use "restore from iTunes backup" when the backup was of a jailbroken iPhone. You risk poor battery life and instability.

However - this problem doesn't affect everyone and my advice is to make a backup of your iTunes backup. Then use the "restore from iTunes backup" option, test it out for a day or so, then if you experience problems with battery life then restore the phone again and set it up as new, then selectively restore the files you require from the backup of the backup that you carefully made earlier.

Hi Olethros,
I also notice that starting with fw 4.0 to current, the restore from backup seems to be very stable. Previously, as you have stated, restore from backup can be problematic at times. I'm not sure if it's because of fw or itunes 10.x ... i also noticed the syncing and backup of iphone is much faster than before.

Originally Posted by dtube

Hi Olethros,
I also notice that starting with fw 4.0 to current, the restore from backup seems to be very stable. Previously, as you have stated, restore from backup can be problematic at times. I'm not sure if it's because of fw or itunes 10.x ... i also noticed the syncing and backup of iphone is much faster than before.

I've also noticed this. My anecdotal experience is that it's okay to restore from iTunes backup when going to another iOS version in the same major version i.e. from 4.0 to 4.2.1 but problems can occur when going to a new major version 2.x to 3.x or 3.x to 4.x

Also, I've only tested with backups that contain legitimate activation. Backups that were made of hacktivated phones (especially when they lack valid push certificates) might be more problematic.