The bootloader did not read the file correctly, or the firmware crashed upon initialization.
A computer with Visual Studio Code (VS Code) installed, alongside the and Marlin Auto Build extensions (if compiling from scratch).
Updating firmware on the Sunlu T3 can improve performance, fix factory bugs, and unlock features like increased hotend temperatures or optimized bed leveling. Official Version v3.40 (released Oct 2022) Firmware Type Marlin 2.0 Primary Method microSD Card (Auto-update on boot) Key Hardware STM32F103 MCU (32-bit) Preparation & Requirements Before beginning, ensure you have the following: MicroSD Card: Must be formatted to with a small allocation size (e.g., 4096 bytes). Firmware File: file named exactly firmware.bin for official/custom Marlin, or specifically configured for Official Downloads: Available via the Sunlu Support Page (v3.40 is the latest stable official release). Update Procedure (SD Card Method) Obtain the correct file for your specific machine version. Ensure the microSD card is clean and formatted to FAT32. Copy the file to the root of the SD card and rename it to firmware.bin Turn off the printer. Insert the SD card into the printer's slot. Sunlu T3 Firmware Update
The Sunlu T3 features a bootloader that allows for easy updates via the microSD card slot. SUNLU T3 Marlin Configuration and Controller Board Pictures
The update process was straightforward, and John followed the on-screen instructions carefully. The printer's screen flickered as it rebooted, and the progress bar moved steadily. Twenty minutes later, the update was complete, and the T3 restarted. The bootloader did not read the file correctly,
Help you find the best for the new firmware.
Firmware acts as the operating system for your 3D printer. Outdated firmware can limit your machine's potential. Official Version v3
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.
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