Engineers do not have access to customer codes.
If the code is lost the engineer can not just put the engineer code in and then put a new customer code, it does not work like that.
If lost only thing to do is a default.
Problem if engineer locked panel ,then control panel useless and new pcb required.
You are not understanding what you are being told.
If you do not have the master code you will need to default panel.
Your code is assigned to a user level which can not change a code so the only way to change the code from a user to a master level is default the panel.
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