There are two methods to root a 1.5 version Nook classic. Check nookdevs.
I rooted to get the improved library app which combines documents and b&n into a single library and is searchable, and to get the trook app which reads news feeds, allows browsing and downloading from public domain collections without having to hook up to a computer using usb as well as making a wifi connection to a book collection on your computer using Calibre. There is also an app which allows you to read Google book streams directly.
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