Moving from Jb'd 3G to 3GS

[phrint]

I need some guidance. I currently have a 3G that is jailbroken and unlocked. I picked up a 3GS on eBay with the old bootrom and running 3.1.2. When I get this phone, what is the proper way to switch from my 3G to my 3GS without losing the 3.1.2 on the S? Do I simply restore the 3GS from my 3G backup through iTunes then jailbreak and unlock?

I have found the proper info for prepping my 3G to sell in its jailbroken form by searching so I am good there.

Any help here is appreciated. I searched for a while here and couldn't find anything specific about switching phones with one being jailbroken.

 

[Applejuiced]

First JB and unlock with blackrain and blacksnow.
Then you can restore from backup if you want to get all your settings and contacts back.

 

[ntrigue]

Do NOT restore a 3GS with 3G data.

You can sync contacts, bookmarks, photos, music and calendar through iTunes but game progress and settings must be lost.

 

[Applejuiced]

Do NOT restore a 3GS with 3G data.

You can sync contacts, bookmarks, photos, music and calendar through iTunes but game progress and settings must be lost.

I have done it and using my 3GS with my old 3G models restored from backup.
Even though people think its not a good idea I never had any problems.

 

[Vandam500]

Do NOT restore a 3GS with 3G data.

You can sync contacts, bookmarks, photos, music and calendar through iTunes but game progress and settings must be lost.

I also don't recommend it. Lots of people have problems (Mainly battery ones) when they sync the settings from 1 device to a different one.

I just recommend you set it up as new and like ntrigue said, you can get the contacts,music,app,etc back easily.

 

[ntrigue]

They make look the same but they are entirely different devices and hardware. Unless you have files that will have you lose your job or marriage you should do a clean install.