I tried this with firmware version 4.12.12111 on My Glo HD and had problems.
I added the line to invert the screen. I saw it in the menu. When I tapped on it, there was a delay, and then my Glo HD rebooted (the screen wasn't inverted).
I tried it in both the main menu and the reading menu.
If I upgrade the firmware in the future, I'll give this another try.
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