Root 2.2 will not install

[aust10n]

I have a rooted Droid. I'm trying to install 2.2, I dont even want/need root. Just never really used any of its features. Well 2.2 won't install. I had a black screen with a explanation point sign and a Droid for 15-20min and nothing happened. I restarted in Hboot. There is said it failed to update. My phone also now says its update, yet I'm not on 2.2
What do i need to do?

 

[pkmn760]

factory reset and try again?

 

[EricS96521]

You either need the May OTA update or you need to format your SD card to FAT32 and try again.