I did try 6S on mine using some alligator clips to daisy chain them together. Still does the same thing. The set button pressed while powering on takes it to the setting menu, but after that, the set button does nothing and it just cycles through the setting tones on it's own like I'm not pressing the button 100 times repeatedly cursing it in vain...
Oh well... was worth a try.
Oh well... was worth a try.