Is it possible?

[bigdavecox90]

To unlock an iPhone that is on the 2.2.1 update?

[Johno]

Not too sure if you can (if you have already upgraded to 2.2.1 - someone can probably clear this up), I think you need to use a custom .ipsw to downgrade the baseband to the previous version.

From the DevTeam blog:

Yellowsn0w will NOT work with the baseband version (02.30.03) that is present in the recent 2.2.1 update. If you want to use Yellownsn0w you will need to create and restore using a custom .ipsw that will allow you to update safely to 2.2.1 without applying the 02.30.03 baseband update. You’ll then have a 3G iPhone running 2.2.1 with an older baseband version that is still vulnerable to yellowsn0w, following these steps ensures that yellowsn0w will still operate.

http://blog.iphone-dev.org/post/7427...he-stable-door
http://blog.iphone-dev.org/post/6779...eat-yellowsn0w

[bigdavecox90]

Not too sure if you can (if you have already upgraded to 2.2.1 - someone can probably clear this up), I think you need to use a custom .ipsw to downgrade the baseband to the previous version.

From the DevTeam blog:

http://blog.iphone-dev.org/post/7427...he-stable-door
http://blog.iphone-dev.org/post/6779...eat-yellowsn0w

It has only just been purchased so will it have already come with 2.2.1?

[Johno]

I reckon so, go to Settings and then About - In there it will tell you your version and your modem firmware (baseband)