There is no way to provide an option for that. It's a necessary step as part of securing the platform. End users don't get a choice about moving to Android 13 if they want security updates, regardless of what OS you run.
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The OS is what burns the fuse. It should be entirely possible to remove that code, and make it conditional on a post-installation prompt.
If the user says "no", they can still use the modified Android 13 without burning the fuse.
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We aren't going to disable a security fix that has no impact on end users.
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For example, this means I cannot even _try_ GrapheneOS anymore, without losing my ability to keep using LineageOS if I change my mind.
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As stated, all operating systems on Pixel devices must be on Android 13 to get full security updates. There isn't any leeway there.
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As a user, you have the freedom to stay on an old version, at the cost of having missing security content, which I don't really suggest.
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But it's entirely possible to install (a modified) Android 13 and NOT lose the ability to downgrade.
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You do lose the ability to downgrade the Titan M2 firmware regardless of which OS you use and based on our experience with the migration from Android 11 to Android 12, they do not preserve backwards compatibility. We're the only ppl who noticed since others don't use what broke.
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I probably already lost that, then, since I tried the A13 beta...? But Android 12 continues to work right now.
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The features which tend to break are only used by a small portion of apps such as our Auditor app.
But most apps are versioned separately from the OS anyway? Auditor is the exception since it's bundled with Graphene, but in theory, if you supported an older version at all, you could fix the compatibility of the app, right?
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We can't, because part of the OS itself would be broken.
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