It looks like Apple is finally trying to put an end to jailbreaking the iPhone.
Reportedly, all the iPhone 3GS units shipped starting last week have a new botroom (iBoot-359.3.2) that makes jailbreaking impossible.
According to iClarified, iBoot-359.3.2 is not vulnerable to the 24kpwn exploit which is used by the Dev-Team (among others) to jailbreak older iPhones and iPods.
So if you’re getting a new iPhone 3GS and want to jailbreak it, you should look for old stock, or buy a refurbished unit.
The new iPhone bootrom may have other exploits than the 24kpwn, but it will probably take a while until developers find them.
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