Steps for Firmware update:
For example, change HDMI to LVDS. Default:
# HDMI
setenv wmt.display.param 4:6:1:1280:720:60
# LVDS
#setenv wmt.display.param 2:0:24:800:480:60
Change to:
# HDMI
#setenv wmt.display.param 4:6:1:1280:720:60
# LVDS
setenv wmt.display.param 2:0:24:800:480:60