There is a new Firmwere release available. Actually it has been available since last October.
There doesn't seem to be a whole lot in it:
Software: PXW-FS7 : Binary Package V4.20 (Win + Mac) : Software/Drivers : Other : Sony Professional
I got the new 256gb cards and they wouldn't work without this firmware. So I think it is more of a support update. I was not aware of the new firmware till the cards wouldnt work and had to search for it. Glad that you posted.
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