GrapheneOS It's not at all safe and should not be used. It won't provide a preview of the GrapheneOS experience either since it's incredibly outdated. The OS was based on Android 12 QPR3 rather than Android 16 QPR2. Sandboxed Google Play also isn't going to work on it anymore. The services it depends on are going to be shut down too.
Thanks for your answers.
As I said, I'm fully aware of this, my everyday phone is a 6a with updated GOS. The 3a device is for basic use like listening to music and podcasts and, even for that, I don't want my personal datas extracted to Google.
So I think that an out-of-date GOS is still better then Google android (which is also out-of-date), right ?
That's the point why I'm searching the file.
That said, I can understand that you don't want out of date GOS in the wild.