Corona V6, xkey, RGH and CR4 issue

Got a xkey for my Corona V6. But found that I needed to get DVD key first. and in order to do so I needed CR3 lite or wait for CR4.

See following post for the above:
"http://www.se7ensins.com/forums/threads/newbie-how-to-get-dvd-key-off-a-360e-console.1174925/"

Got CR4 and Corona QSB V3 Slim Adapter.

So just need instructions on how to install CR4, get DVD key and uninstall CR4.

Then install Xkey and I should be good to go.

Any pointers will be greatly appreciated.