MODULES_CUSTOM=0
DEBUG=0
DEBUG_GMENU2X=0
DEBUG_UMTPR=0
FS_CHECK=1 
BOOT_LOGO=1 
FLIP= (put 0 or 1 to overwrite)
INVERT= (put 0 or 1 to overwrite)
TVMODE=0 
HOTKEY_CUSTOM=1

Only "0" and "1" are accepted values