2.2.1 standard phones not able to downgrade using

So after attempting to downgrade my phone which came standard with 2.2.1,5 times UNsuccessfully,i tried this same exact method on my girlfriends phone which came standard with 2.2 and BAM! first try success!! so my theory seems to be proven right when i assumed that 2.2.1 standard phones are somehow incompatable with 2.2 software.
but more than likely theres a there will be someone out there to crack that mofo and get us 2.2.1 users either able to downgrade back to 2.2 or better yet GIVE US ROOT ACCESS!! either way is good for us!please anyone with info on their current work on 2.2.1,keep us updated on what you got going on.were all here to help improve our phones!so anyway we can help,im sure we'd all be happy to assist!