Saw an interesting note on the Google support forum:
1. You MUST have an unlocked AT&T N1.
2. Flash ERD79 stock ROM (boot, system and recovery partitions). You can google for instructions on how to do this. (link to Modaco removed)
3. Apply ERE27 update as stated in several websites.
4. Apply Android 2.2 Froyo update. Google for it.
5. Voil? You have your AT&T N1 working with Froyo
Now, my concern here is that he's referencing a ROM at Modaco.. I'd want to snag one direct from Google. Not sure if it's possible to flash EPE54b to ERD27.. but if possible, damn.. that would be slick. Take three steps backwards, to get a running start and then jump into Froyo!
Anyone see how this couldn't possibly work, or might this be an effective workaround to get us AT&T N1 users onto Froyo?
D.