BIGTREETECH SKR MINI E3 V3.0

This motherboard is the ideal replacement for an Ender 3 or 5. It features silent TMC 2209 drivers, a 32-bit processor, and exactly the same form factor as the original Ender 3/5 motherboard. It is super easy to install: simply remove the old motherboard and connect all cables to the SKR MINI E3, then you can download the appropriate firmware from github and upload it via an sd card.

Moreover, this feature-packed motherboard can also be used for other printers, running your own Marlin or Klipper firmware

You can find more information about this mainboard here: Github