GrapheneOS…though it’s a a fully featured and production ready Operating System (OS), not a “ROM.”
“GrapheneOS is a privacy and security focused mobile OS with Android app compatibility developed as a non-profit open source project. It’s focused on the research and development of privacy and security technology including substantial improvements to sandboxing, exploit mitigations and the permission model.” https://grapheneos.org/
GrapheneOS…though it’s a a fully featured and production ready Operating System (OS), not a “ROM.”
“GrapheneOS is a privacy and security focused mobile OS with Android app compatibility developed as a non-profit open source project. It’s focused on the research and development of privacy and security technology including substantial improvements to sandboxing, exploit mitigations and the permission model.” https://grapheneos.org/