Unable to flash Klipper in Skr mini e3 v3

General Discussion
5
  1. See BIGTREETECH-SKR-mini-E3/firmware/V3.0/Klipper at master · bigtreetech/BIGTREETECH-SKR-mini-E3 · GitHub
  2. Make sure that it is really the “pure” E3 V3. Multiple variants do exist
  3. As you can see from the ls /dev.... command, the name contains Marlin. This is a 100% sign that the board did not flash the firmware
  4. For more general items see Issues flashing the printer board