Tried installing the high-score kit, game would not boot properly.

Possible that the kit is defective?

Website: https://highscoresaves.com/Centipede-Free-Play-and-High-Score-Save-Kit/SW10066.5
Manual: https://www.highscoresaves.com/media/c9/eb/d0/1758926890/how-to-install-centipede-free-play-and-high-score-save-kit.pdf?ts=1758927049