PRS T2 not detected in ADE

I bought a PRS T2 thinking it would work with my public library, only to know later that this Overdrive function has long been dropped from Sony readers.

So I thought of copying my library's DRM ebooks via ADE but it doesn't show in it (the reader is however well detected by windows)

I installed kobo descktop and tried to authorize adobe from there but I always get syncing error on that Kobo desktop.

is there a way to fix this in order to read my public library's ebooks on my PRS T2 ?

thank you