10 sekund szukania w google:
https://www.scantool.net/scantool/do...reliminary.pdf
STRSTNVM - Reset NVM to factory defaults
All programmable parameters can be turned off and reset to their default values by holding RST_NVM input low for a predetermined amount of time (between 5 and 20 seconds, specified in the device datasheet or user manual). After RST_NVM input is released, device will set all factory defaults, and then perform an ATZ reset.The same operation can also be performed via the STRSTNVM command.
Krótko mówiąc factory reset - przywrócenie fabrycznych parametrów. Np. po zmianie baud rate i innych konfigurowalnych opcji.