I am trying to use this:
http://www.ebay.com/itm/USB-to-TTL-C...item2327a7ac1b
Well I have already reported, and got my replacement, but it would cost me a fortune to send them back my broken one (actually getting the new one cost half a new kindles price :S) that they let me keep the "broken".
It is that I just want to experiment with it, maybe I can bring it back to life. It is on the YKNR page.