If you want to factory reset inovance MD500 drive then follow this process:

Step 1: Press "PGR" button and then press "Down" button the goto the parameter group "FP".

Step 2: When display show "FP" then press enter "Button" and then goto the parameter "FP-01".

Step 3: After enter into parameter "FP-01" select option "1" and then press "Enter" button.

Step 4: Then "power off" drive wait 5 min and "power on".

After this all parameter set to the factory default.