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There's a firmware update for a Sony A7Rv : version 2.1 I believe. My A7Rv has V.2 and refuses to accept V2.1 . It says with any card that I use that it doesn't recognise the card or its corrupt, yet they are the same cards that I use in camera- they are formatted of course to take the update. Anybody else with this problem?
New Firmware is 2.01 not 2.1, 2.01 maybe it's your actual Firmware? Can you ceck?
https://www.sony.co.uk/electronics/support/e-mount-body-ilce-7-series/ilce-7rm5/software/00292265