Back to Froyo

I have no idea how, sorry. I am curious though as to why you want to roll back? Something wrong?
 
You may have to search around because a number of links was posted and was also pulled down. I do not have a working link anymore, sorry cant help with a link.

Try searching for 2.3.340 sbf..
 
This is by far the easiest way....

1. Downloaded the file noted HERE. All instructions are there as well.

2. Burned the .iso file using software imgburn.com.

3. Started up laptop from burned dvd in step 2.

Followed instructions. Very simple one step process once you've burned the cd/dvd.