Navigate to Configuration > Store Settings or send the G-code command M502 followed by M500 to initialize the new firmware parameters. Bed Leveling: Re-run your manual or auto-bed leveling mesh.
Before flashing new software onto your printer, gather the necessary tools and prepare your hardware to avoid bricking the mainboard. 1. Gather Your Tools
The regular printer status screen will boot up once the process is complete. Sunlu T3 Firmware Update
| Problem | Likely Cause | Solution | | :--- | :--- | :--- | | | Wrong screen firmware or bad SD card | Reformat SD (4096 bytes). Re-download the DWIN_SET . Use a different brand of SD card (Sandisk works best). | | Printer beeps continuously | Mainboard firmware name is wrong | Rename file exactly to firmware.bin . Ensure it is the correct file for your motherboard chip (STM32F103 vs F407). | | Touch screen says "No printer attached" | Mainboard and screen firmware versions are mismatched | Flash the mainboard again. Then flash the screen. Version numbers must align (e.g., both v2.5.3). | | Printer freezes on boot logo | Corrupted bootloader | You need to use an ST-Link programmer to force flash the bootloader (advanced). Or contact Sunlu support for a replacement motherboard. | | Thermal Runaway error on first heat | PID values are wrong | Let the printer cool. Run the PID tuning command immediately. Do not try to print until PID is saved. |
Insert the SD card into the (not the mainboard slot). Turn the printer ON . Navigate to Configuration > Store Settings or send
Incorrect pin assignment or inverted logic for the Z-homing probe.
Exit and save, then run make to compile the klipper.bin file. Re-download the DWIN_SET
A: The V3.43 overseas version defaults to a language setting that may show Chinese on first boot. Simply navigate to the configuration menu and switch the language to English.
Updating the firmware on a Sunlu T3 (also known as the "Terminator") is a common procedure used to resolve issues like , enabling PID tuning , or adding advanced Marlin features . The Sunlu T3 uses a 32-bit controller board that is largely a clone of the BigTreeTech SKR Mini E3 V2 , which makes it highly compatible with standard Marlin firmware. Finding the Firmware
Downloaded directly from the official Sunlu website or their official support channels 3DPrinterUniverse 3DPrinterUniverse. Step-by-Step: Sunlu T3 Firmware Update Process Updating the