As promised, Sony just released updated firmware for A7III, A7RIII and A9 cameras. In my previous article I mentioned that Sony will release update in mid-December.
Today they published firmware fixes, versions 2.10 (for A7III & A7RIII) and 4.10 (for A9).
You can download the updates here: Sony A7III, Sony A7RIII & Sony A9. (Update) The updates has been removed from the Sony website.