Guz , i've not seen a .RFW extension before, so not sure what it does. i'll suggest that you try opening it with S1res and see if can be loaded, guide here
http://www.mympxplayer.org/how-to-mo...ool-vt206.html
You might need to rename the file extension to .FW to allow the S1res tool to open the file.
If it can be opened by the S1res tool, then try flashing it into your player, guide here
http://www.mympxplayer.org/how-to-up...ayer-vt46.html
You might need to again rename the extension to .FW