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Your Fender Mustang (V2) amp's firmware can be updated by the user with the Fender FUSE software and your amp connected. To do this, please follow the steps below.

  2.  Turn off the power on your Fender Mustang amp. While holding the Save button (or the Data Wheel on III, IV, & V),  turn the power back on.
  4. If you selected to install from the Bundled option, the firmware update will begin as soon as you click the Bundled button. If you chose the dowonloaded option, please proceed to step 5. Otherwise, move to step 6.
  5. (For Downloaded option) Once you have selected the correct firmware file, click Open, and Fender FUSE will automatically begin the firmware update process.


Fender Mustang firmware version 2.1 is the current version of Mustang firmware.


  • Known issues: None.


The Fender® Mustang™ I-V Amplifiers (V.2) feature the following new amp models and effects.

New Amp Models

  1. “Fender ’57 Twin”
  2. “British Watts” 
  3. “British Colour” 
  4. “‘60s Thrift” 


  3. “Greenbox” - 
  4. “Orangebox” 
  5. “Blackbox” 
  6. “Big Fuzz” 
  7. “Ranger” 




The EXP-1 expression pedal calibration procedure is as follows:

  • Move the expression pedal between the desired heel and toe endpoints to set the range.
  • Turn the encoder knob to the next Preset to complete the process.