Yamaha MU100R EPROM with OS Firmware 1.11 Tone generator Update Upgrade Mu-100R


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Yamaha MU-100r Firmware Update: 1.11

This is firmware update 1.11 and is the latest official released operation system by Yamaha. This operation system update/upgrade requires one eprom chip and the chip will be labeled to help you locate the correct chip socket. For more info, please check below.

You can check your current OS rom by holding [PLAY] and [Mute/Solo], while you turn the power switch on.


There is nothing documented due to that Yamaha didn’t share this information for this device. We are only talking minor bug fixes to improve the midi sysex and general operation system stability.


  • Fully verified before shipping and professionally packaged in anti-static material.
  • There exist a Yamaha MU-100, MU-100B and MU-100R, this is for MU-100R.
  • The IC socket is located at IC 11