I have a problem with my Ender 3, which has a V1.1.5 mainboard. I tried to flash firmware that supports BLTouch, but after flashing it, the display shows a blue screen and the control knob/buttons do not work.
I also tried flashing the original firmware back onto the printer, but it still doesn’t work.
For flashing, I used a USB ISP programmer set to 5V.
Could someone please help me figure out what went wrong and how I can fix it?
Thank you!