I strongly suggest that you install Jenn Holt's firmware if you got this display as it fixes a lot of bugs with the original firmware. Strange symbols will no longer appear while writing commands to the screen, the backlight will not flicker and contrast will work properly (odd that this even was a problem as it has nothing to do with the microcontroller).In addition, writing to the screen (text/graphics) is a lot faster.
I strongly suggest that you install Jenn Holt's firmware
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