I set up my DNS-343 a LONG time ago and changed from the default password to something else. 
That was a longtime unfortunately, I cannot for the life of me remember what it was, and the one that I stuck on the back dose not work.  I have tried everything I can think of - but still no success. 
1) Can I do a factory reset or will all the data be lost ?
2) How do I recover from this?