Sony issued a9 Firmware Update FW 1.01 to address Overheating Warning
• This utility updates the camera firmware to version 1.01 and improves the overheating warning functionality.
Sony a9 Firmware Update FW 1.01: MAC | WIN
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Sony also released firmware updates for A6300, A6500, A7II, A7sII & A7rII as well.
https://briansmith.com/sony-releases-a7ii-a7rii-a7sii-a6300-a6500-firmware-updates/