Come on guys... there's a lot of difference between reading a FDR / CVR in "normal circs", and one (as here) apparently damaged / not readable.
The manufacturer will no doubt have tools to dismantle / read the memory chips way beyond the average "reader" which seems, in this case, not to have worked.
Unless of course, for post maint / non public transport / whatever reasons they were not functioning at all on this flight
NoD