Two Trees Sapphire Pro Firmware Upd -

You cannot flash firmware meant for an SKR board onto a generic board, and vice versa. Opening your electronics box to visually inspect the board is the safest way to confirm this.

You can use official firmware or community-compiled versions of Marlin. TwoTrees Firmware Download two trees sapphire pro firmware upd

If your board doesn’t support SD card bootloader, use the DFU (Device Firmware Upgrade) mode. You cannot flash firmware meant for an SKR