Xperia 10 II broke down - after service installed Android 12 - now no Android support app in Jolla store?

You have to use Emma from Sony under Windows.
You’ll find infos there:

You can download emma there:
https://developer.sony.com/develop/open-devices/get-started/flash-tool/download-flash-tool/

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I would do the Emma tool flashing as @ESON proposed. This helped me to fix my Xperia 10 plus. However, for downloading pure Android you could check: Images système génériques (GSI)  |  Plate-forme  |  Android Developers