Before starting, join the "Sunlu T3 Owners" Discord or Reddit community. If you get stuck, a member can share a pre-tested .hex file and a visual wiring diagram for the USBasp—saving you hours of frustration.
After updating the firmware, verify that the update was successful by: Sunlu T3 Firmware Update
This is critical. The printer’s bootloader will only flash a new firmware if the filename is different from the last one you used. Before starting, join the "Sunlu T3 Owners" Discord
Copy the renamed .bin file to the root directory of the SD card. Insert the card into the printer’s SD slot (not the USB port). The printer’s bootloader will only flash a new
While Sunlu doesn’t release weekly updates, the current recommended version (typically based on Marlin 2.1.x) includes:
If you encounter any issues during the firmware update process, here are some common problems and their solutions:
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