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Din Sync RE-303 firmware

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Latest firmware

1.4.3
released 5 Nov 2021
Download firmware from github.com

What's new in 1.4.3

## General - Updated version number. - Updated changelog. ## Core - Fixed a bug in MIDI parser on Note messages - Added optional MIDI thru support. ## Bootloader - Added output of version info over serial. - Added test serial command 'r' to reboot. ## RE-Emu - Fixes to MIDI note out - Small fix to port e output - Added output of version info over serial. - Added output of target cpu being emulated over serial. - Fixes to upd444 memory emulation - Improved TR-808 support thanks to some memory fixes. - Added MIDI-thru support. - Reverted D650C port initialization value to fix issue https://github.com/sunflowr/recpu/issues/8 - Added some serial status logging. - Fixes to Settings version updating. - Added MIDI in/out channel, send note, omni mode, and remote mode to config menu. - Fixes to memory IC selection in TR-606 emulation. - Added MIDI in note support on TR-606 (remote mode). - Added support for MIDI omni mode message - Fixed pin assignment of PE0 and PE1 on TR-808 - Changed how MIDI channel is selected on 303 - Added option to reset Settings in settings menu. - Added option to enable/disable midi thru in settings. - Added remote mode to 303, 606 and 808 (work in progress) - Fix in note stack on TB-303 ## Documentation - Added note about bug fix to sysex max size - Spell fix on bug note in changelog - Updated MIDI implementation chart for - Updated changelog - Updated TR-606 MIDI implementation chart - Updated settings to reflect changes in RE-Emu

Last checked 25 Oct 2026

Release notes on github.com ↗

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We check Din Sync's official download page for the Din Sync RE-303 every day. One message per release. No spam, no newsletter.

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How to update the Din Sync RE-303

These steps are for the Pixie RE-CPU. Download reemu.syx from the latest RE-CPU release. Connect your MIDI interface MIDI OUT to the middle MIDI jack labelled MIDI IN. Hold the C key and power-cycle the RE-303; when the keyboard lights sweep left and right (and a short bassline plays) the bootloader is active, release C. Send reemu.syx with a SysEx tool; the LEDs show the upload progress and the unit reboots when done. If the upload fails, enter the bootloader and send it again. Update the bootloader (bootloader.syx, sent while the unit runs normally) only when the release notes ask for it. Older RE-303 units with the Sonic Potions CPU use a different firmware and update procedure.

Just for reference. For complete and up-to-date instructions, always refer to the manufacturer's official firmware page.

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Din Sync RE-303 firmware update history

Changelogs summarised from the manufacturer's release notes.

1.4.35 Nov 2021

Release notes for this version are listed above.

Release notesopens in a new tab — github.com

Tracked in 1 rig on FW//RADAR.

Din Sync RE-303 firmware FAQ

What is the latest firmware for the Din Sync RE-303?

The latest firmware for the Din Sync RE-303 is version 1.4.3, released on 5 Nov 2021. FW//RADAR last checked Din Sync's official page on 25 Oct 2026.

How do I update the Din Sync RE-303?

These steps are for the Pixie RE-CPU. Download reemu.syx from the latest RE-CPU release. Full instructions on Din Sync's official firmware page.

Where can I download Din Sync RE-303 firmware and drivers?

Directly from Din Sync's official firmware page — FW//RADAR links to the source and never hosts firmware files. Official firmware page →

Where can I find the Din Sync RE-303 manual?

The official Din Sync user manual is a PDF hosted on github.com. Din Sync RE-303 user manual (PDF) →

Is the Din Sync RE-303 still receiving firmware updates?

The last firmware release we recorded is 1.4.3 from 5 Nov 2021. FW//RADAR still checks Din Sync's page daily.