Digital Editions does not recognize and authorize sony PRS-505

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The problem is that it my first purchase a DRMed ebook at dieselbooks and I dowloaded digital editions and authorized it with no problems,

i downloaded the ebook and i was able to read it on digital editions. But the problem is that when i plug in the sony reader digital editions does not recognize it, so i cant authorize it and im unable to read the ebook on sony reader prs 505.

Since the ebook is DRMed i cant use another program to do it, i tried acrobat 8 with no solution.

Do you guys have an idea how to solve this problem?

[Guest]

Make sure you have installed and are running the latest Sony EBL software, the installation contains the needed drivers for ADE to talk to the 505. Note: if you are running on a Mac, ADE will not be able to talk to the 505 and you will have to use the Sony EBL 3.x instead.