Quoted from Mathazar:

Full disclosure: I don't have a F2K yet (it's on my wish list for a future project).
I'm pretty sure it can be reset like my Stern Meteor and early Bally's. Get to the high score record via the self test on the coin door, then push the button the MPU to clear it.

Quoted from Mathazar:

You could have some floating bits/garbage in NVRAM on the MPU. I would do this: after getting thru the self test items from the coin door (after the stuck switch test, I think), "zero out" all of the remaining audit/bookkeeping settings by pushing the button on the MPU for each of the remaining selections in the coin door test routine. This will zero out everything, including score thresholds for free games/extra balls, high score, credits, coin drops per slot, etc. etc.).
After that, reboot the game and see if your 5157575 is gone. If it is, problem solved....now go back into those settings and set up the values you want for free game thresholds or other MPU settings that are done through the door and not the switch bank on the MPU (consult the F2K manual for those options).

Quoted from HPR:

I restored all inserts for my F2K and create those files, not sure if i still have, i will check later.

Quoted from Robotworkshop:

I’d start with the basics. How is the power and voltages? Is the driver board original and has the driver board been gone over? Typically the main 5V capacitor will need to be replaced as well as a few ground mods to the driver and a 5V jumper. Once gone through the original boards are great. Next I would check the MPU. Maybe a failing PIA or RAM chip.

Quoted from Robotworkshop:

That board is responsible for some but not all of the voltages. Some are done on the driver. Was it replaced with another used board or new one? There are several new replacement options. Some are better than others but most should work fine in that game. That particular board is often burned up on many machines and getting an aftermarket is usually the best for that one. I usually prefer original boards for the rest. If the displays stopped working after replacing that board did they double check their work and verify all the voltages are correct?
Another thought is if the battery is going bad on the MPU or if it has a small memory cap and game was off too long you can lose the settings and get garbage data in there. A picture of the MPU will help.