Panasonic has announced an extensive series of feature-enhancing firmware updates for its S1, S1R, S1H and S5 full-frame mirrorless cameras, along with the G100 Micro Four Thirds model. All five updates will become available on November 24, 2020.

The updates vary between models, often adding features and improvements from the other cameras. For example, the boost in AF performance for the S1H, S1R and S1 brings them inline with the performance of the S5.
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https://www.dpreview.com/news/0915264785/panasonic-firmware-shares-more-features-across-s1-s1r-s1h-and-s5