Replacing Android OS on Samsung Galaxy S20

[WuFlu]

I want to get a S20, replace the stock OS with GrapheneOS. Quesitons:

1. Does Samsung have a proprietary camera app? If so, will my camera be limited by Graphene?
Or, does Treble alleviate this problem? If not, can I get the Samsung app onto Graphene?

2. I want to keep the Samsung UI, I've heard it's really good on the S20. I see this phrase "One UI".
Is this specific to Samsung, and if not, where can I get it?

Thank you.

 

[Hadron]

Where are you? A European Exynos S20 will probably be bootloader unlockable, but I don't know whether that's been done yet. A US Snapdragon S20 almost certainly won't be. So if you are in North America you should decide which is more important to you, the s20 or Graphene, because it's extremely unlikely you can have both.

Yes, the Samsung has a proprietary camera app. Very much so. I'm not a Samsung expert but I'll be surprised if you can make the Samsung camera app work on Graphene. Manufacturers who modify the OS heavily usually make their own apps depend on their modified framework, and installing a different ROM will of course remove all of that.

The "One UI" is part of Samsung's OS build. That will also go if you install Graphene.

Do you know whether anyone has actually built Graphene for the S20 yet? It's obviously not one of the officially supported devices, but not owning an S20 I've not kept up with what, if any, ROMs exist for it at present - there are however no development threads for it at all over at XDA, which isn't promising, though someone has posted instructions for rooting the Exynos s20+ with Magisk (which is just rooting the Samsung ROM, not replacing the OS).

(Sorry if the post is making presumptions when I assume that you are not planning on building Graphene yourself. I'm just assuming that someone with the knowledge to be able to do that would not be asking some of these questions).