Fernando –
I have had exactly the same problem.
I reformatted the drive (at the suggestion of the chat tech support), re-downloaded and re-installed the iphone software (again at the suggestion of the next chat support person).
But I still get the same results – transferred photos have long hexadecimal names.
I did get it to work once for me, retaining the original names, but repeating exactly the same steps produced a different result with the long invented names – very frustrating.
And, I am discouraged to see that you have had no replies since early February.
To my mind this problem makes the device unusable and I am considering a return of the one that I bought. Too bad – it seemed to have so much promise.
– Bart