The is widely known as a clone of the Ender 3 and typically uses firmware based on the Marlin 3D Printer Firmware . Because it uses an older 32-bit control board (often a clone of the SKR E3 Mini V2), you can find official and community-archived versions online. Official and Community Firmware Sources

After editing, connect your PC to the T3 via USB (use Pronterface to find the COM port). Click "Build" in PlatformIO, then upload. Once verified, you can export the .bin to an SD card for future flashes.

⚠️ Never download T3 firmware from unverified third-party sites – corrupted firmware has been known to brick the touchscreen.

The official firmware.bin files are hosted on the Sunlu Support Page and archived by community members on GitHub . 2. Custom Firmware Options: Marlin vs. Klipper sunlu 3d - Facebook