Reprogram D2071A with Lock code

Any ideas how I can reprogram a D2071A DACT of I don’t have the right lockcode? Thanks!

Just a reminder…

Violation of Rule P8, Removed by Moderator

Sorry about that. Newbie here. Any ideas where I can go to solve the problem? I spoke with the last tech who programmed it and he wasn’t much help. He said the default code was what they used bit it isn’t working for me. I wonder if my D5200 is bad. Thanks for any advice.