Flying Bear Ghost4 and Tornado 2pro 3D printer motherboard firmware upload tutorial

4 motherboard marlin firmware upload，newest version is Ghost marlin v2 *Modified the problem of filament runout sensor display error *Repaired the communication speed between touch screen and motherboard This is firmware download link: 2pro motherboard marlin firmware upload *Modified the problem of filament runout sensor display error *Repaired the communication speed between touch screen and motherboard This is firmware d