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This question has been answered a thousand times. Did you search before posting?
IF your device was eligible for beta, a banner would have appeared on the Samsung Members App. You would have needed to click on it, register your device, download the software...
No banner? Not eligible for beta. It is currently full anyways
In terms of stable release, we are currently on beta 2 and it is looking pretty stable. We expect the stable release to occur later this month or early February for S24 devices.
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My device is an S25 Ultra.