Yesterday chrismorty asked me regarding his just bought iPhone 3GS jailbreak problem. chrismorty told me that he purchased a new iPhone 3GS and he tried both blackra1n and pwnage 3.1.4, after the jailbreak process when he reboots the phone it enters in to black coma mode. After reboot, it just turned black and didn’t reboot, what you can do is only restore. confirmed that the very recent iPhone 3GS haz an iBoot update. Apple updated iBoot –359.3 to iBoot –359.3.2 and the latest iBoot isn’t vulnerable to the 24kpwn exploit.
If you purchased your 3GS a week before and you are facing any problems with your jailbreak pocess then check your iBoot version, simply put your phone in DFU mode and then check in System Profiler for the iBoot version. In short until Dev team founds a new hole in the new bootrom normal jailbreak would be impossible. The only possibility would be that of a tethered jailbreak but it is quite inconvenient as you have to re-run the jailbreak every time you restart the phone. So if you are planning to buy a new iPhone 3GS then note both blacka1n and pwnage tool will not work for you.