How do I get my EVO 4G back to Froyo 2.2?

I know a very little about Android flashing. I have spent about four days trying to figure out how can I get my phone back to Froyo 2.2 release without any luck. I followed the ROM Utility Update document and was able to flash the phone back to 2.1 update. The problem is that once you are on update 2.1, the Sprint never sends you any more Over The Air updates. I am unable to get the phone to update to Froyo 2.2. I have tried a few different methods and I have only been able to flash the phone to 2.1. How do I get the phone to a froyo 2.2 so I can take an OTA 2.3 update as well? I had rooted the phone before and that’s why I need to get it back to a factory 2.2. How do I get my EVO 4G to Froyo 2.2? Please help.

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