Trying to change ADT alarm code but no longer an ADT subscriber

When I bought my house almost nine years ago, I got an ADT control panel hardwired into my wall and electrical system. We no longer use ADT but still use the alarm itself in case someone tries to enter the house while we’re asleep. (We are in the process of installing SimpliSafe but haven’t yet finished doing so.) A former housemate is no longer welcome in our house so we want to change the alarm code, but following the instructions we’ve found online doesn’t seem to work. The version of the control panel we have is the Safewatch Pro 3000. Any advice would be appreciated.


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