Unlocking a Delta HMI usually comes down to either finding the documented code or initializing the unit and starting fresh. If the project inside is proprietary and you don't have the password, your best bet is to contact the original Machine Builder (OEM).
Unlocking a Delta HMI password typically involves trying the factory default or using the hardware "System" button to access configuration menus. If you've forgotten a custom project password, you may need to factory reset the unit, which will erase the current application. 1. Try Default Passwords unlock delta hmi password