Apple's servers are probably still steaming hot from the rush to download iOS4.1 but hackers have already found a bootrom-based exploit which will could allow them to tinker with any device that uses the mobile operating system.
The recent update slammed the door on a number of methods including the web-based JailbreakMe, which allowed a number of iDevices to run unapproved software, but coders from both the infamous iPhone Dev Team and Chronic Dev Team are already reporting successful exploits aimed at the gadgets' bootroms.
If this turns out to be the case, Apple will have its work cut out stopping jailbreakers, as a simple firmware update won't be enough to close the hole.
Could this be the Holy Grail for iPhone fans... a permanent jailbreak that can't be circumvented my an iOS4 software update? We'll have to wait and see.
In the meantime, those in the know are advising owners of unlocked iDevices to steer well clear of the 4.1 firmware update, as installing it on a fiddled iPhone could lead to carrier unlocks being permanently reversed. Which would leave you with a very expensive, though admittedly pretty, paperweight.