Well, I’m afraid swapping out the SD card and flashing it with clean data from GitHub was the best shot. You can download the firmware and flash it if you want to try. Instructions are in the FAQ:
https://www.ledseq.com/faq-category/game-frame/
I just have my doubts that that will fix it. Strange this happened when you changed the time. Did you use the remote to do that, or did you move the Game Frame around itself?
One thing to try is unplugging the Game Frame, holding down both NEXT and MENU buttons on the rear, and then plugging it back in. It should run a color test. See if that crashes after awhile. If not, it’s likely something about the connection to the SD card.