there is nothing much different between 2.2.1 and 2.2, just some minor fix only, and only mac can retain the baseband at 2.28.00.

but if your iphone boot loader is 5.08 you can always downgrade your baseband into 2.28.00 if you accidently update or update it by yourself.

this is my suggestion( suggestion only ok~). if your bootloader is 5.08 can update it with 2.2.1 firmware, jailbreak it, then install 3G fuzzyband downgrader then downgrade your baseband into 2.28.00 then after that install yellowsn0w and you can use your iphone back.

im remind you that you must be on bootloader 5.08 in order to use it.


good luck then..


p/s: anyway dont need to open new topic because i think you can post it up at
iphone club version 9 or yellowsnow unlock



cheers
Taka.