I first posted this in the PocketPRO forum, but since this applies to all Hanlin V5 readers I thought that it might be more appropriate here?
A new Lbook based firmware from Buggins has just appeared. In the bookshelf setup there is a new category for adjusting the eInk display. This is definitely experimental firmware, so if anyone wants to try it, caveat emptor.
http://files.mail.ru/6UDLRS
If you want to give any feedback, it is being discussed here:
http://www.the-ebook.org/forum/