downgrade from 2.2 to 2.1 on my EVO

[okwassup]

I need to downgrade to 2.1 if its doable from 2.2 ., i installed some RUU for 2.2 to downgrade the Radio., but it didnt work for me ., i would need to see if it works for what iam doing when i have 2.1 .
seen some thread on XDA , but pretty dumb no links to files ..etc ., would not want to look and download wrong file files steps and brick the phone ., so is there a link tutorial any one aware of with links names .. to all files needed . to bring my EVO to 2.1 ., or hey maybe 1.5
sincerely any good feed back is helpful iam sure.