Fender Tune Support has a new home! Click here or go to https://tune-support.fender.com to visit our new support home. Related articles Effective March 20, 2020 Fender® FUSE™ has been discontinued. How do I update the Firmware on the Mustang LT amplifier? Mustang GT Support Fender Play Support has a new home! How do I update the firmware on a Mustang GT or Rumble digital amplifier?