Its longevity has made it a favorite in the maker community for DIY repairs and upgrades for older machines.

Are you trying to (like a BLTouch or new firmware) or fixing a broken connection ?

A quick way to identify your board is to check the version printed directly on the board's surface.

[ POWER INPUT ] [ BED HEATER ] [ HOTEND HE0 ] | | | Fuse Bed MOS HE MOS | | | [ MAIN FAN ] [ THERMISTOR TB ] [ THERMISTOR TH0 ] | [ X MOTOR ] --- [ X LIMIT ] [ Y MOTOR ] --- [ Y LIMIT ] [ Z MOTOR ] --- [ Z LIMIT ] [ E MOTOR ] --- [ FILAMENT / BLTOUCH port (optional) ] | [ FAN0 (part) ] [ FAN1 (hotend) ] [ FAN2 (board) ] | [ 5V / GND AUX ] [ RST ] [ BURN ] | [ SERIAL / DISPLAY PORT ] | [ USB-B PORT ] [ MICROSD SLOT ]