Lost connection to mcu ender 5

Just my 2 ct. I studied your klippy.log for almost 1h.

I agree with

It also shows “b’Got EOF when reading from device’”

Before checking the hardware, I would start over with a new, fresh SD card and give it a try.

Oh, I forgot. If you try that, please create a fresh kippy.log.

Good luck, hcet14