you just have to download Far manager 1.7 with the SEFP DB2020 plugin install them following tutorials, launch Far 1,70, tape F11 and select SEFP plugin...with your W580 you've to choose DB2020 CID 52 then click "enter the matrix", then connect your phone without sim and M2 card while holding "C" button, then put your swf flash menus to the flash menu folder (just search in the tutos in the other posts, i don't remember very well the path) then disconnect the phone after clickin a few times on ".." to unload the loadbreakers,then disconnect your phone... replace sim and M2, upload some themes loading flash menus and... enjoy!!
Here are some photos of some flash menus on W580i: it works very well and it's beautiful!!! flash menus are Female line, grouped desktop, Everchanging from S500i (totally tested at different dates and it works great!!!)