this post might help: http://community.wd.com/t5/My-Book-Live/rolling-back-to-plain-latest-firmware-removing-custom-installs/m-p/579433#M23837
Just a note on btsync: is it really “minuscule footprint”? I mean, it is a very small file, but in my experience it consumes way too much CPU and bandwidth!!! So much that MBL is not sleeping anymore, and my tabletPC is heating up way too much…
I am using btsync at present, but seriously thinking of replacing it with some other “less demanding” piece of software.