Home Improvement Questions? Ask a Handyman for Answers ASAP
Can you advise if you still have the key, and confirm the model number, and that you need both the key and combination to open the safe (most only require one or other - not both).
Are you sure M771113 is a model number and not a serial number, as Diplomat dont list this as a model?
Ok I will opt out for another colleague to assist, as I dont believe I can assist you without the correct model.