Help unlocking w580i

[rapidroll]

I found the MAIN file but it was a .fbn. Would it still work when making the vkp?

The MAIN should be (*.mbn) and FS should be (*.fbn).
Thogh you didn't mention what is your phone's CID?
I'm giving you the link that I downloaded form TOPSONY Download Section
Download this If your phone is CID 52 :W580_R8BE001_MAIN_GENERIC_LA_RED52