I don't know what device you are using. But Samsung has given the Beta update only for selected few regions to the S24 series Only. Some of the few regions that have access are USA, Korea, India, and UK. Sri Lanka is not an eligible country for the beta program of One Ui 7. After Samsung launches the S25 Series on January 22nd next year. Most provably, other devices will get the stable One ui 7 update in the first quarter of next year. So we should wait until that. If your device is a Galaxy A52s 5g. Sorry, your device is not eligible for the One Ui 7 Android 15 update.
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