how to restore iphone 3GS with new bootrom to factory settings

[huyla]

I purchased a new 3gs phone recently without contract but locked to a provider. It already jailbreak it with blackra1n RC3 and possible unlock it with Sn0w (I have to test with different provider sim to see if it's unlocked yet?)

Though I know i have a tethered jailbroken iphone (need to hook up to computer after a reboot) it works fine with WIFI and GPS but no YouTube atm

My phone spec: 3GS 16G
Version 3.1.2 (7D11)
Model: MC131C

I realize that this is not my phone and I want to return the phone the Apple Store to get a full refund (still 14 day of purchase period)? How do I restore to its factory settings without any jailbreak bread-crumbs?

 

[Applejuiced]

If you're going to return it to apple just plug it to itunes and hit restore.

 

[WPB2]

let me get this straight. you know how to jailbreak, but you don't know how to restore?

What is the world coming to???

 

[huyla]

No, I don't really know that's why i asked. Is there a problem of asking?

 

[Applejuiced]

let me get this straight. you know how to jailbreak, but you don't know how to restore?

What is the world coming to???

Lol