Ok I was out on the deck listening to the EFi-82MT's (Closed version of the DT880's Mshenay :P )
Came in took a picture with the phone and that schiit HTC decided it wanted to reset... Any way put everything back together and the phone decided it would dump the pictures...
Here is a picture of the DT880 I took a couple of days ago.
You need to stick a thin screwdriver or knife blade in any of the red areas on the picture.
Pry back and work the ring up till it's free, it just snaps in with 3 tang around the ring.
DO NOT go too deep as the driver base is right underneath the foam piece and you can puncture the cloth material really easily.
When you flip the driver out of the cup (the whole disk come out) do so very gently.
***THE TANGS THAT THE HEADPHONE CABLE AND VOICE COIL WIRES CONNECT TO ARE JUST PRESSED INTO THE PLASTIC AND WILL PULL FREE VERY EASILY***
Sorry for the above but it cannot be stressed enough, liquidzoo any myself had to reconnect hair thin voice coil wires to fix out drivers, we were lucky.
Sorry it took so long good luck and if you need help just ask.