I've heard that it's possible, and I have the .17 firmware .zip file, but I have no idea how to actually do it, step by step.
I don't buy any Kobo books, and I turned off Reading Life as I have "won" all the awards I'm going to get and it never keeps track of all the books I have read (over 500 but RL say 16
), so syncing is not something I do unless I must reformat.