?About Firmware?SKR 3 mainboard is directly compatible with Marlin and Klipper firmware (RepRapFirmware need to debug first). Firstly download firmware on GitHub website of name “firmware.bin", copy and save it to SD card, firmware must bed reserved, then re-plug the SD card and wait to 10s. When the status indicator stops flashing and the file name in the Micro SD card is renamed to "FIRMWARE.CUR" then update sucessfully. Note: Our control board come without SD card. ?Thermistor Protection Design?Adding protection circuit for the thermistor to avoid burning of main control chip caused by hot bed or heater creepage. The resistance value of thermistor of SKR 3 also supports PT1000 by wire jumper to select pull-up resistance value. In this way, it’s convenient for DIY by eliminating the connection of external module. ?DIY Friendly Interfaces?BOOT0 is added for programming firmware in DFU mode. WIFI module (ESP-12S, ESP-07S, ESP32) enables you to easily debug RRF. SKR 3 motherboard also supports bltouch, resume printing function, RGB lights, blocking detection and shutdown after printing function. What’s more, it’s also compatible with TFT35 E3 V3.0/TFT35 V3.0/TFT28 V3.0/12864 LCD display as well as TMC2209, TMC2208, TMC5150, DRV8825 stepper motor drivers. ?Robust Power System?SKR 3 controller board is equipped with TPS5450-5A power chip, which supports power input of DC12/24V and output current of 5A (peak output 6A ). With its robust power system, SKR 3 motherboard can firmly will be the perfect supporter for your Raspberry PI. ?New Upgrade of SKR 2?BIGTREETECH SKR 3 mainboard is the upgrade version of SKR 2. Its processor is upgraded to 32-bit 550MHz ARM Cortex-M7 series STM32H723VGT6.The running speed and printing accuracy of SKR 3 controller is greatly increased by 30%+ while its working noise become lower.