The SD card failed to update the motherboard so looking at an alternative
Recently I’ve attempted to insert a bootloader on to the 32-bit CR4NS200320c13 motherboard using Arduino Uno because the SD card reader has failed despite using six different sd cards. So am looking for a non wifi way (my preference) to upload the bootloader via the Arduino and am blindsided as to the correct data pin locations on the board.
I’ve looked at a number of YouTube videos for this topic but all refer to the 8-bit printers. As I’m a newbie some assistance would be appreciated. As you know Creality don’t issue circuit diagrams of their boards, no idea why.