This is the latest firmware update from Olympus. They released Version 3.4 for the OM-D E-M1 Mark II, Version 2.0 for the OM-D E-M1X and Version 1.2 for OM-D E-M1 Mark III.

This new firmware provides feature enhancements for photographers and ability to use focus stacking photography with M.Zuiko Digital ED 150-400mm f/4.5 TC 1.25x IS PRO lens which is $7500 at Adorama and B&HPhoto.
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https://www.dailycameranews.com/2020/12/new-firmware-updates-for-olympus-e-m1x-e-m1-mark-iii-and-e-m1-mark-ii/