The 2.2.1 firmware update contains a baseband firmware update (02.30.03) which is not compatible with yellowsn0w. Since many users can’t hold their horses and accidently upgraded their 3g phones to 2.21 update. The 2.2.1 update results as upgrade to firmware 02.30.03 And you may know, YellowSn0w only works on 2.28 baseband. Previously, those of you that upgraded to 2.2.1 could not use YellowSn0w. Now it’s possible to downgrade from baseband 02.30.03 to 02.28.00 due to Georze Hotz as he release a bs patch file to be applied to ICE2_02.28.00.fls allowing …