The phrase "to reset the system" means to restart or return the system to its original or default settings, often to fix problems or clear out any errors or issues. It is like starting over fresh. Full definition
This effective meditation can reset your system in a few short minutes — no yoga or meditation experience needed. (yogajournal.com)
The system brought me smoothly to a complete stop but I had to immediately reset the system using the button on the steering wheel to get going again. (cnet.com)
However, once you have all six, do NOT reset the system and select a level, or else you will lose them all. (gamerankings.com)