The Sony Xperia 10 II has been added to the company's Open Device program, which is a great resource for ROM developers looking to build AOSP software for the phone or to port custom ROMs. There's one hurdle to clear first - Sony is yet to enable bootloaded unlocking for the Xperia 10 II. That can't be far off, however, as without unlocking the bootloader, there's no way to flash a custom ROM. Anyway, Sony also updated the Android 10 binaries for the old Xperia 10 and 10 Plus models, the Xperia 1 and 5 flagships (again, the 2019 versions) as well as several older...
Source: https://www.gsmarena.com/sony_adds_xperia_10_ii_to_the_open_devices_program-news-43800.php