Using Sony PRS T2 ereader and latest ADE ebooks problems

Can anyone categorically help please? I have the above ereader and had been using it to download library books from my UK library. However the library have now changed to using ADE, which I have downloaded, and created an account, all okay. I can download books to my laptop but when I try to drag or send to my ereader, they look like they have been sent/copied, but are not actually on the ereader. (I have checked htere is enough memory and there is plenty on the ereader!)

I see from Adobes list of compatible devices that the PRS T1 is compatible, but cannot see the T2. Does this mean I cannot use ADE as the T2 is not compatible??? Please help!!

Many thanks