Sony Xperia Stock ROM is the official operating system that comes pre-installed on Sony Xperia devices. It is based on Google’s Android platform and includes customizations and additions made by Sony.

The Stock ROM is the operating system version that the device shipped with. It is what users can revert to if they wish to unroot their device or restore it to its factory state.

Some users may also choose to flash a Sony Xperia Stock ROM onto their device if they are experiencing software issues or wish to downgrade to a previous operating system version.