I have a flashed Droid. What happens if I update to Froyo?

[Thugganomics]

I have a Droid flashed to Cricket running Android 2.1 (ESE 53). As you can probably tell, I'm not that well versed in all things Android so of course, I'm concerned about updating to 2.2. What will happen to my flash if I do so?

 

[frunkiss]

I was about to ask the same question. BUT I SEARCHED FIRST.
Can anyone help answer this?