Sunlu T3 Firmware Update Link

| Problem | Likely Cause | Solution | |--------|--------------|----------| | Nothing happens when powering on | Wrong firmware version (e.g., V1.4 file on V1.3 board) | Double-check board version. Revert to older known-good firmware. | | Screen stays blue indefinitely | SD card not formatted correctly | Reformat FAT32, 4096 bytes. Use a smaller card (≤16GB). | | Printer shows “No printer attached” | LCD firmware mismatch | Update LCD firmware separately, matching the main board update. | | Filament sensor stopped working | New firmware has different pin assignment | Check Sunlu T3 community config files (e.g., from Team Fugu or official GitHub). | | Update “bricked” the printer | Bad flash or power loss during update | Use an ST-Link programmer (V2) to recover the MKS Robin Nano board. |

firmware update process, from downloading the right files to flashing your machine, ensuring a smooth upgrade experience. Why Should You Update Your Sunlu T3 Firmware? Sunlu T3 Firmware Update

Place the firmware.bin file onto the root (top‑level) directory of the freshly formatted microSD card. Do not put it inside any folder. | Problem | Likely Cause | Solution |

Plug the power cable back in and turn on the main power switch. Use a smaller card (≤16GB)