He ran (mesh bed leveling). The probe (a simple BLTouch he also installed) tapped 25 points across the bed. The LCD displayed a mesh—a gentle hill in the center.
If your S8 is still on stock firmware, you don’t own a 3D printer—you own a loud, dangerous kit. Upgrade it. Write your own resurrection story. sunlu s8 firmware upgrade
The is a large-format FDM 3D printer known for its affordability and build volume (300x300x400mm). However, its stock firmware is often a closed-source, basic Marlin variant. Upgrading the firmware is a rite of passage for S8 owners—turning a timid workhorse into a silent, safe, and feature-rich machine. He ran (mesh bed leveling)
He exhaled. The bootloader was alive. The S8 could now listen to USB commands. If your S8 is still on stock firmware,
Using (or avrdude via command line), he connected to the S8 via USB. Selected: Marlin.hex . Clicked "Flash" .
Hands shaking , he wired the Arduino Uno to the S8’s board, pin-to-pin. He uploaded the “Arduino as ISP” sketch to the Uno, then opened PlatformIO to flash a bootloader.