OneOS: a second Android on Samsung alongside One UI — switching without flashing

⚡ The gist in 5 seconds - OneOS has been published on GitHub — a second Android system that lives alongside One UI on a rooted Samsung Galaxy. - Switching works both ways and, according to the author, without flashing the device. - There's one requirement: root. The list of supported models and Android versions is not specified in the repository. ### 🔍 What was found The fahadalijaved23/OneOS repository has been published on GitHub. The author's wording in the description: "Another Android, next to One UI: switch a rooted Samsung Galaxy into another Android system and back, without flashing." The key point is "next to" — meaning the second system is installed not instead of One UI, but alongside it: Samsung's shell stays in place, and an alternative Android is added to it, with the user switching between the two. There are no implementation details in the description: no list of compatible devices, no Android version inside the image, no file sizes, and no explanation of how the switching works. So it's impossible to attribute A/B slots, a loop image, or Magisk modules to the project — that remains speculation. Only one thing follows from the text: a full system image is not flashed via Odin, otherwise the procedure would be called ordinary flashing. Everything else is on the conscience of the author and anyone willing to risk testing the build on their own device. ### 💡 Why it matters For Galaxy owners with an unlocked bootloader, the choice has long been an either-or: either One UI with all its services, or an AOSP build — and going back requires a full reflash with data loss. OneOS promises to remove this limitation and turn a second system into a switchable mode rather than a separate way of life. There is one serious caveat: this involves root, which on Samsung traditionally triggers Knox and the loss of some services — plus it's a personal project by a single developer, not something from the company itself. Before trying it, it's worth waiting for at least a list of supported models. ---