Using ISPSoft, perform a "Factory Reset" via the memory card. Warning: This deletes everything (program, registers, and password). You will need a backup file.
The safest way to regain access to a locked Delta PLC is through official channels or previously documented credentials. Standard Reset via Programming Software : Use official tools like delta plc password unlock software new
How do I set a password for projects on HMI? - Delta Electronics Using ISPSoft, perform a "Factory Reset" via the memory card
: Specialized services can recover passwords from project files if you can provide the locked file. delta plc password unlock software new