Sunlu S8 Firmware Upgrade May 2026

Leo opened his S8’s electronics case. The green Melzi-like board stared back. He located the (6 pins: MISO, MOSI, SCK, RESET, 5V, GND).

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. sunlu s8 firmware upgrade

avrdude: safemode: Fuses OK (E:FF, H:DE, L:FF) Leo opened his S8’s electronics case

The LCD flickered, went blank for 3 seconds—an eternity—then rebooted. He ran (mesh bed leveling)

He clicked . The lights flickered. The console scrolled:

Then, the noise test. He commanded a G1 move. Silence. Only the fans whirred. The motors purred like cats. Leo loaded a 9-hour PETG print—a large dragon that always failed before due to warping and missed steps.

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.