:
https://www.sonyalpharumors.com/new-firmware-update-4-0-70-200mm-fi...
New firmware update 4.0 for the 70-200mm fixes a major issue
Sony issued a new 70-200mm GM firmware update at Sony support and Sony Australia.
This update (version 04) resolves an issue where some products may not operate properly after updating to version 03.
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https://esupport.sony.com/US/p/model-home.pl?mdl=SEL70200GM&LOC=3#
http://www.sony.com.au/electronics/support/lenses-e-mount-lenses/se...
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https://photo.popco.net/58191