I’m having the same issues my USB is on the fritz and I have the same issue going on!
I read around and I found out that there is a hardware encryption that is taken place on that little mini board that is attached to the hard drive in the enclourse. The only way to get your data is to get the part and replace it!!!
I looked all over ebay and all the parts are to old models nothing within the last few years… I’m in the same boat as you have you had any luck? If so what did you do? Did you go with a company?