A really good guide how to flash a k610i to a w660i is here: Converting K610/K618/V630 and K530 to W660. Full Guide! - myForum
Most files you need are there except custom packs for some regions. I used it and it works no problem. It uses the illumination patch method. I was wondering if anyone has come up with a patch that makes everything work as it should on a k610i@w660i ?