+1 to the above advice, I edited the OP to make it clear the files here are to only be used on the original Droid Incredible.
That said, you should be able to use the same basic steps, you would just need to find the appropriate clockwork zip that has been packaged for the Evo. Assuming you are talking about the Evo 4G, I believe it would be renamed to PC36IMG. The letter/number combo you are seeing when it flashes in the screen real quick isn't always the same as what you rename the file. If you are on a different version of the Evo (3D, etc), it would again be different files and nomenclature.
Then, you would also want to find the most recent, appropriate version of the su.zip for your phone. I would hope there is an unroot guide listed in the all things root subforum for your device here on AF. If you can't find one, make a new thread in the root forum there asking for some direction and I'm sure the root users there will get you fixed up.