Sony Mobile's Open Devices program is popular among Android hobbyists and aftermarket developers, given Sony's current market position. The OEM provides necessary tools and guides to the development community, which makes it possible to bring Android Open Source Project (AOSP) builds to select Xperia devices. This initiative can also be used as a base to port well-liked custom ROMs. The Sony Xperia 10 II (pronounced as Xperia 10 "Mark 2") has now become the latest addition to the Open Devices program.
Matter of fact, Sony released the kernel source code as well as the device tree for Xperia 10 II a few weeks ago. Now that the AOSP software binaries are available for download, third-party developers should be able to modify and build vanilla Android 10 to boot on this smartphone with minimum effort. Interestingly, Sony's official bootloader unlock page doesn't list the Xperia 10 II as a compatible device as of yet, which means there is no way to install a custom ROM on this phone right now, but one can expect this to be remedied in the near future.
Download AOSP Android 10.0 software binaries for the Sony Xperia 10 II
Apart from adding platform support for the Xperia 10 II (code-name "Seine"), Sony has also refreshed the software binaries for the Xperia 1/5 ("Kumano"), Xperia 10/10 Plus ("Ganges"), Xperia XZ2/XZ2 Compact/XZ3 ("Tama"), Xperia XA2/XA2 Ultra ("Nile"), and the Xperia XZ Premium/XZ1/XZ1 Compact ("Yoshino") with various improvements. Enthusiast users can also take a look at kernel compilation guides and guides to access the UART port, although the latter is largely impossible on modern Sony Xperia phones.
The Xperia 10 II succeeds both the Xperia 10 and Xperia 10 Plus from last year. The phone is powered by the Qualcomm Snapdragon 665 SoC, while there is only a single memory configuration consisting of 4GB of RAM and 128GB of storage. It packs in a triple (12MP + 8MP + 8MP) rear camera setup, and a 6-inch FHD+ OLED display with a 21:9 aspect ratio.
Source: Sony Developer World