Amazon.com: Geekstory for ATMEL 51 AVR USB ISP ASP Microcontroller Programmer Downloader with Cable + 10Pin to 6Pin Adapter Board for Ender 3 or Ender 3 Pro : Electronics
Using the AVRISP Programmer
Atmel-ICE
Top Quality ISP Cable for RT809H Programmer Optional Accessories IDC10 Female Welding color Strandsof Tinned Copper Wire adapter