@alpc
Yes, none of those other files will work in a 255W or any 2xx series. You only need the image. Have a read of what the other files do if you like to bother: [Only registered and activated users can see links. ].

Make sure you do a files backup and also an NV (Non-Volatile Memory) back up as well before you play around with it [particularly seeing it's a borrowed unit ]: [Only registered and activated users can see links. ].