This is where I went to, ElectroMan, but there doesn't appear to be an update for the 51FD, as you can see...it's all for the LX models (unless I'm missing something here!!)
Anyway, after having given the Pioneer a test run with comparative side by side tests with the Pana BD35, I have decided to keep the BD35.
Picture quality on the BD35, on my tv at least, is superior to the Pioneer (unbelievable, but true!), although sound is definitely better on the Pioneer, but considering the many limitations of the Pioneer, it's headed for E-Bay.
I will only upgrade to a BD55, and nothing else.