How can the Dell Storage SCv3020 controllers be factory reset without credentials?

We received a second-hand Dell Storage SCv3020, but unfortunately, we do not have the credentials or the server environment to work with it. Our question is: If we erase the external HDD, will the storage be GDPR-compliant for the new owner? Additionally, can we donate the storage, and will the new owner be able to use it without the firmware? We were unable to find an answer or the necessary firmware for this. Thank you!