Currently the firmware does not work correctly with the latest production batch of TYT MD-UV380 or MD-UV390 Plus 10W radios because there seems to be some difference with the LCD screens in these radios which cause the display brightness to be low
Do not install the OpenGD77 firmware on these radios unless you accept that the screen brightness will not be high as the official firmware
Currently we have no idea why this latest batch of radios has this problems, but it does seem to be releated to the LCD panel its self, because connecting a 5W UV380 front panel / screen to a 10W Plus body fixes the problem