Prima Support Resources

Here you will find support information for our Prima 32-way accessory decoder.

Prima resources include product information, manuals, tutorial videos, and software updates for using Prima with points, servos, LEDs, relays and layout accessories.

Product information

• Open the full Prima product page
• Open the refreshed Prima support page

Manuals

Use the current manual for firmware 2.0.17. Older editions are retained only for reference with earlier hardware and firmware.

• Prima Complete Manual v2.0.17 (PDF)
• V1.1 Prima Manual (legacy)
• V1.0 Prima Manual (legacy)
• V0.5 Alpha Manual (legacy)

Tutorial videos

These are the original Prima tutorial videos from the previous support page.

Open video 1 on YouTube

Open video 2 on YouTube

Open video 3 on YouTube

Open video 4 on YouTube

Open video 5 on YouTube

Firmware update: version 2.0.17

Version 2.0.17 is a complete offline factory flash for a CMMME Prima ESP32. It includes the firmware, bootloader, partition table, web interface and flashing utility. Arduino IDE, Python and an internet connection are not required.

• Download the complete v2.0.17 updater package (ZIP) — includes the updater, manual, README and SHA-256 checksums.
• Download the v2.0.17 Windows updater (EXE)
• Download the v2.0.17 complete manual (PDF)

Before updating

1. Disconnect DCC and the external 5 V supply from Prima.
2. Connect Prima to a Windows PC using a data-capable USB cable. USB must be Prima’s only power source during the update.
3. Close Arduino Serial Monitor and any other application using Prima’s COM port.

Install the update

1. Download and extract the ZIP package.
2. Run CMMME-Prima-Updater-2.0.17.exe.
3. Select the Prima USB/COM connection, read and confirm both safety notices, then select Install firmware 2.0.17.
4. Keep USB connected until the updater reports success.

Important: this is a complete factory flash. It erases existing Prima settings and Wi-Fi details, so the unit must be configured again afterwards.

The updater is not digitally code-signed, so Windows SmartScreen may show an unrecognised-app warning. Verify the SHA-256 checksum in the downloaded package before choosing More info > Run anyway. If no COM port appears, install the driver for the USB serial chip on the board or try another data-capable USB cable.

Support checklist

• Prima version and firmware if known.
• Accessory type: servo, LED, relay or point motor.
• Power supply and wiring photos.
• Controller/software used with the layout.