Sunlu T3 Firmware - Update

Updating the firmware on a Sunlu T3 (also known as the "Terminator 3") is often a necessary step for enthusiasts because the stock firmware has several known limitations, including fan mapping errors and disabled PID tuning for the bed. The T3 is essentially a modified Ender 3 clone using a 32-bit board similar to the BTT SKR Mini E3 V2. Available Firmware Options

Are you updating to fix a specific bug (like the Z-axis being off), or are you looking to enable new features like Klipper or manual mesh leveling? Sunlu T3 Firmware Update

Transfer the File: Copy the firmware.bin file to the root directory of the card. Updating the firmware on a Sunlu T3 (also

6) Step‑by‑step: USB serial flashing (Marlin on 32‑bit STM32/ATSAMD)

(Used when SD update not supported or using custom Marlin build.) Transfer the File : Copy the firmware