Hello all, 
  
I was having thepod x3 live stuck on update flash problem. Finally, finally got it resolved today. This worked for me: 
  
1) Try and use the USB ports located on the back of your computer if possible.  i.e. one that is soldered to your motherboard. 
2) Use the version 1.0 firmware. 
  
Note: step one was suggested by Line6Don. Thank you! 
Also, after I got the pedal working w/ version 1.0 firmware, I tried updating to the newest firmware and the problem came back. 
I went back to version 1.0 and the pedal is working again! Thank goodness... 
  
Good luck y'all. 
  
Dave