hi all i have problem with klipper software install in my ender 3 pro. How install software to board using isp usb adapter i dont other bootloader
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Flash a Bootloader first: Bootloaders - Klipper documentation
I had the exact same issue with the exact same board. If you are using the stock board I recommend either of two things: 1) flash the board using the isp usb adapter following the exact instructions that come with the isp usb. If you got it from creality you need to do it using the prog isp software (see this link). That update will install Marlin and the bootloader. After that, you can flash Klipper using their instructions. The second option is more complicated. Assuming you are using a raspberry pi, flash an image with the bootloader using raspberry pi, use some jumper wires connected to the GPIO pins, turn on your raspberry pi and let it run for good 20 mins (just to be safe) and you are good to go. I basically followed the instructions on this video. This is the hardest part and you have to be patient. After you load the bootloader you will be able to flash any firmware using your computer or raspberry pi using just the USB interphase! Good luck.