Use USB S/N only if it's correct, so we can override it in EEPROM

prusa/link/printer_adapter/printer_polling.py

@@ -543,7 +543,11 @@ def _get_serial_number(self):
  # If we're connected through USB and we know the SN, use that one
  serial_port = self.model.serial_adapter.using_port
  if serial_port is not None and serial_port.sn is not None:
- return serial_port.sn
+ try:
+ if self._validate_serial_number(serial_port.sn):
+ return serial_port.sn
+ except RuntimeError:
+ pass
  # Do not ask MK2.5 for its SN, it would break serial communications
  if self.printer.type in MK25_PRINTERS | {None}:
  return ""