Mastermind Version History Log

This log contains a list of changes that have been made to the Mastermind GT, LT and PBC over time. This is not yet complete, but more information will be added later. For now, change information on older versions can be found on the RJM Forum.

You can download the latest firmware at

Version 5.1.0



Version 5.0.1

Version 5.0.0

Version 4.9.1

Version 4.9.0

Version 4.8.2

Windows editor release only, fixes a transfer issue between editor and Mastermind GT

Version 4.8.1

Version 4.8.0

Version 4.7.0

Version 4.6.3

Version 4.6.2

Version 4.6.1

4.6.1 started as a bug fix release, but I decided to squeeze in a few extras that didn't quite make the cut for 4.6.0.

Version 4.6.0




Revision #4
Created 10 October 2023 06:09:41 by RJM Music
Updated 10 October 2023 09:26:01 by RJM Music