Download and Install Firmware for SidecarTridge Croissant Keyboard Emulator

SidecarTridge Croissant Keyboard Emulator Firmware

The SidecarTridge Croissant Keyboard Emulator firmware runs on the RP2350 and is used by the internal Croissant keyboard-emulator board for Atari ST and Atari STe systems.

You can update the firmware in two ways:

• use the Web Flash installer in a Chromium-based browser
• enter BOOTSEL mode and copy the .uf2 file manually to the RP2350 USB drive

For the complete procedure, read the Firmware Update guide or refer to the Croissant Quickstart.

Release Types

✅ Before You Start

Before updating your SidecarTridge Croissant firmware:

• ensure you are using the Croissant firmware, not the Soufflè one
• connect the board to your computer with a micro-USB cable
• have the .uf2 firmware file ready if you plan to use manual flashing
• follow the Firmware Update guide for the exact BOOTSEL and Web Flash steps

ℹ️ What’s the Difference Between “Release” and “Debug” Firmware?

• Release Firmware
  Optimized for normal use. This is the recommended version for everyday operation.

• Debug Firmware
  Includes extra debugging output intended for troubleshooting and development work.

If you are unsure, use the Release version.

ℹ️ What’s the Difference Between STABLE, BETA, and ALPHA Releases?

• STABLE Release STABLE
  Fully tested, production-quality firmware.
  Recommended for normal use on real Atari ST and STe machines.

• BETA Release BETA
  A release candidate. Includes new features or fixes that are still being tested.
  Suitable for experienced users who want to try the latest changes.

• ALPHA Release ALPHA
  Experimental firmware under active development.
  Intended for testers and advanced users only.

👉 If in doubt, always use the STABLE release.