https://mhhauto.com/Thread-Husqvarna-450x-Robot-lawn-mower-read-out-pin

" Discover PIN code If the PIN code of the robotic lawnmower is lost, it can be found. In the PIN entry mode or when the main menu is displayed: Press and hold the 9 key for five seconds to display a combination of twelve letters and the mower serial number.
If the mower remains stuck due to incorrect PIN entry, please wait before making another attempt to read the letter combination.
The combination of letters may be different during different attempts on the same mower with the same PIN code.
Contact the national service company and indicate the combination of letters and the serial number. The correct PIN can then be identified.
Press BACK to exit this function "

Attól,hogy nyomkodhatod a gombokat,még nem biztos,hogy az agya foglalkozik a kóddal...