I assume you have tried the typical unlock maneuvers, i.e. slowly driving forward while turning left then right (not on pavement!)? Occasionally I have had to drive 20-30 yards before it would unlock.
I haven't done the gray wire mod, so I can't comment on that.
I had to remove the motor and unlock it with a screw driver. Yes, i did try forward and reverse with the wheels slightly turned about 15 times. Finally had to give up and drive home with it locked as I had no tools with me.
I had to remove the motor and unlock it with a screw driver. Yes, i did try forward and reverse with the wheels slightly turned about 15 times. Finally had to give up and drive home with it locked as I had no tools with me.