I've also found a PDF on the European Pioneer website mentioning the update and a set of update instructions:: https://products.pioneer-car.eu/sites/pioneer_products/files/avh-z9200bt_dab_fw_update_instruction_ver107.pdf
Here is the changelog from the European website: https://products.pioneer-car.eu/sites/pioneer_products/files/avh-z9200bt_dab_change_history_ver107.pdf
Here is a French site listing the firmware update too: https://www.touslesdrivers.com/index.php?v_page=23&v_code=78529&v_langue=en