hi there,
LOL, Welcome to testing… 
They always do but we want more… 
Stay on it , your close you’ll get it.
SO is there a BIN or flash file that is the factory stuff?
if so as a safety net. I would blank the S3 and re-image it.
Does it show up in the Arduino IDE?
Ok, SO I just ordered one… I got it without the Xiao soldered I’ll put a socket on there. 
HTH
GL PJ
Stay tuned.!