Kuronami,
My player uses firmware version 3.5.35 and is not compatible with 3.5.37 as they have slightly different menu systems so I doubt if 3.5.35 is compatible with your 3.5.37 player.
I take it you did not backup your firmware before you flashed your player. If you did you should be able to reload your backup.
If you did not here is a link to a version 3.5.37
http://www.alexejw.net/firmware/3.5.37%20dump.zip this may recover your player.