There were different rumors that the upcoming Greenpois0n jailbreak tool might not support all devices. Chronic Dev Team member pod2g has given an update on this. The rumors were not right. The developer has confirmed that the updated Greenpois0n tool will do an untethered jailbreak on iPhone 4, iPhone 3GS, iPod touch 3G, iPod Touch 4G and iPad running iOS 4.2.1 OOB.
Here is what pod2g has tweeted:
About the 4.2.1. OOB jailbreak : it will be for all devices supported by gp at that time.
Previously we have seen Joshu Hill, they key member of Chronic Dev Team posted a teaser video revealing untethered iOS 4.2.1 jailbreak. The video shows the iPhone 4 device being operated by untethered jailbreak solution.
The good thing about the upcoming Greenpois0n RC5 jailbreak tool is that it will not require you to have saved iOS 4.2b3 SHSH blobs.
On the other hand pod2g has also found a new exploit to do an untethered jailbreak. But most likely they will introduce it for iOS 4.3 or iOS 5.0. Shatter jailbreak tool is also saved by the Chronic Dev Team which is considered to be the most powerful.
No estimated time of arrival has been told for the release of Greenpois0n tool. We only only that this time they have come very close to release an untethered iOS 4.2.1 jailbreak solution. We know that you are too anxious to get it but you have to be a little patient.