I read the update has a bug fix for when there are balls in the Gene lock and the game is switched off,
From Stern Update read-me: "- If balls were locked in the Demon and the game was turned off, the Demon ball save would be activated during game-over (with a display effect) when the balls were kicked out of the Demon lockup after the game was turned on again. This has been corrected.
I wonder if this v1.28 includes fixing a bug I encountered on the previous code (on a KISS PRO): I locked a ball in Demon, the ball was kicked out and the short ball save was active. While the ball save was active, the ball drained SDTM but I also simultaneously tilted. The display kept going between "TILT" and "BALL SAVED". Never went into "balls missing please wait" search and I eventually had to cycle power.