Sunlu T3 Firmware Update

Sunlu T3 Firmware Update — Complete Guide

Overview

This guide covers why, when, and how to update the Sunlu T3 (and closely related Sunlu models) firmware safely, how to prepare, step‑by‑step instructions for common update methods, troubleshooting, and rollback/verification tips.

Updating your Sunlu T3 firmware is a relatively straightforward process. Here's a step-by-step guide: Sunlu T3 Firmware Update

• Home all axes.
• Re‑level the bed (mesh data is often erased).
• Set Z‑offset again.
• Calibrate e‑steps if the update changed them.

Downloading the Firmware Update

• Back up current settings and any custom start‑up G‑code.
• Save/record current firmware version (Printer menu → About/Info or M115 G‑code).
• Ensure stable power (avoid power loss during flashing). Use a UPS if available.
• Use the correct firmware for your exact board and hardware revision.
• Read the changelog/release notes for the firmware you intend to install.
• If printer is under warranty, check warranty terms before flashing third‑party firmware.

• Requires full backup of original Marlin firmware.
• Requires an MKS Robin Nano config file (the T3 board is very similar to the MKS Robin Nano V1.2).
• Flashing back to Sunlu firmware requires the original .bin and a recovery SD card.

9) Troubleshooting

• Printer unresponsive after flash: