Hold a coin to the tip while turning it on.  If it goes dead, it is apparently the 1st version software; if it does a beeping overload routine, it is the 2nd version.  Mine is apparently the 1st version, as it goes dead (I tested several times, and twice I had to loosen battery to reset after that). Still not getting along with mine (bouts of insane falsing) but after doing that secret reset will try to give it another tryout this weekend before sending in for repair. My Whites TRX, almost