Sunlu T3 Firmware Update

: Use a microSD card formatted to FAT32 with an allocation unit size of 4096 .

Once the boot process completes, the standard home screen will appear, displaying the updated firmware version number. Step 5: Initialize the EEPROM Sunlu T3 Firmware Update

| 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. | : Use a microSD card formatted to FAT32

: Expands the Automatic Bed Leveling (ABL) to a more precise 5x5 grid. Revert to older known-good firmware

Updating the firmware on your Sunlu T3 3D printer is essential to:

Optimizes movement algorithms, potentially leading to faster, smoother, and more accurate prints.

The screen will remain blank for about while it updates. Do not turn off the power during this time.