I cant decrypt one of my Volume ? Need Help!

hello guys I encrypted two volumes of my NAS PR4100. But now I can not decrypt the second volume, even though I have the decryption key and the password. Its really ■■■■, that the decrypt key doesnt Work!. Another Way/Software/or edit the key to decrypt the Volume…?

You should contact WD Support for this issue as they can better assist you with the encryption related issue.

You can contact the Wd Support from the link given below.

I am using old EX2 and can access my encrypted volume but I wanted to decrypt it. Any idea?