I reflashed my mcu while it was probably not needed

General Discussion
2

This looks like the classical issue described at Issues flashing the printer board.

  • Verify your settings.
  • Try different SD cards.

While you’re at it, I’d recommend switching to Katapult.

  • Use the same settings as you would for building Klipper.
  • Build the deployer app.
  • Copy it to the SD card and let it flash.

If it was successful, the board should appear in dmesg with:

[171231.030762] cdc_acm 6-1:1.0: ttyACM1: USB ACM device
[171251.791634] usb 6-1: USB disconnect, device number 3
[171253.119422] usb 6-1: new full-speed USB device number 4 using ohci-platform
[171253.354492] usb 6-1: New USB device found, idVendor=1d50, idProduct=6177, bcdDevice= 1.00
[171253.354542] usb 6-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[171253.354562] usb 6-1: Product: stm32h723xx
[171253.354578] usb 6-1: Manufacturer: katapult
[171253.354593] usb 6-1: SerialNumber: 1B0029000151313433343333
[171253.358901] cdc_acm 6-1:1.0: ttyACM1: USB ACM device

Then build and flash Klipper with:

make flash FLASH_DEVICE=/dev/ttyACM1

Modify /dev/ttyACM1 according to the dmesg output.

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