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If you have forgotten the code for the knob then there should be a master code available from the manufacturer.
Please let me know the make and model number so I can assist you further with this.
Thanks for that;
if the master code is not written in the booklet, then you will need to call Sentry on ***-***-**** or contact them through their online Contact form to request your combination:https://www.sentrysafe.com/ContactUs/Call_Or_Email_Us