Wersi EX20 and MK1 – New OS Firmware Update Upgrade Eprom


SKU: FW-293 Category: Tags: , , ,


This New firmware upgrade is based on the original OS by Wersi, which had some minor midi issues.


  • Fixed – Midi communication/Sysex bugs, which made it impossible to communicate over midi and control/edit the device from an editor.
  • Fixed – Operation system stability and data corruption issues
  • Improved – Internal patches
  • Improved – Expanded firmware OS lifespan
  • Improved – Expanded firmware voice lifespan

And more….


  • This firmware is compatible with Wersi MK1 and EX20.
  • I may ask for your analog filter module revision after your buying this, due to that I have different specific made for the different revisions.
  • Fully verified before shipping and professionally packaged in anti-static material.
  • If you have any questions, please reach out to me and I will gladly help you. 🙂