Updated: UnrEVOked3 and Froyo Update Not So Sweet Together (Sometimes)

If you have rooted your Sprint EVO 4G using the Unrevoked3 utility, then you're going to you may run in to problems trying to perform the official Sprint Android 2.2 update.  If you try and run the update, during the installation, you are going to may end up at a screen with a triangle and an exclamation point.  Yup, it means the update failed.  Want to know what to do?  Read more after the break.

UPDATE: It appears that not everyone who has rooted with Unrevoked is having this issue.  We have seen reports that the update has worked fine for some, with the caveat that you will no longer have root access.  That being said, it doesn't hurt anything (that we've seen) to try and run the Froyo update, but you may want to go in to Nandroid and perform a backup of your ROM first. If it does fail, continue reading below.

If you've tried to run the update and are stuck at the screen with the triangle and the exclamation point, you'll need to pull your battery to reboot your phone.  Don't worry too much at this point.  No permanent damage has been done.  When you put the battery back in, your phone should come back up as normal.  Once it comes back up, you will get a pop up box asking you if you want to install the update.  Obviously, you will need to press either Discard, or Install Later.

Bottom line is this: if you want to update to the official release of Froyo, you will need to return your phone back to stock.  The good news about this is it's not terribly difficult to do.  The bad news is that it's pretty much going to wipe your phone.  The rest of the bad news is that you're going to lose root.

Here are some good instructions for returning your phone to stock:

Unroot and return to stock - AndroidCentral

Once you've returned your phone to stock, you should be able to download the Froyo update again and install it.

If you don't want to do this, then your options are:

• Don't update - yeah, I know, unlikely
• Wait for Unrevoked to come out with a hack of some sort.  There is no timeline on this, and most likely, you will still need to return your phone to stock, run the official update, and then use whatever utility those guys come up with.