Select the firmware & hit the restore button and cross your fingers for 5 minutes.
If you get error message like 1011, 1013, 1015, just ignore them(Actually the firmware 2.2 is already successfully installed).
Dev team already warned don’t upgrade to 3.0 wait for Next version of pwn.
The Dev-Team warns that upgrading to 3.0 with Yellowsn0w installed will cause people to lose Yellowsn0w and will be unable to get it back.
___________________________________________________________________________________________ For the people who wants to downgrade from 3.0 to previous 2.2 or 2.1 use the following steps.
————————————————————————————————————————————————– Connect your i Phone to your Mac or PC and select your i Phone from the list of devices in i Tunes.
There is apparently a third way to unlock i Phone 3G.
Folks at Winandmac have figured out another trick to achieve this without the need to hack your i Phone.
I had reported about the undocumented TV-out feature in i Phone Firmware 2.2 SDK which allow third-party i Phone apps to send video out through the dock connector to an external screen like a television.
Based on some complaints from readers here at i Phone Hacks and discussion threads over at Apple forums it appears that some users have observed that their i Phone battery is draining much faster after upgrading to i Phone firmware 2.2.
Well-known i Phone developer and blogger at Ars Technica, Erica Sadun has discovered that the updated Media Player framework in the recently released i Phone firmware 2.2 Software Development Kit (SDK) offers an option to export video-out live to a connected TV screen.