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It is highly likely that your S24 (US Variant) is not receiving the One UI 7 update because the software rollout is controlled by the US update schedule (and potentially a US carrier). Your current location in Bangladesh prevents the update from being pushed.
One UI 8 is extremely new (or still in Beta/early rollout) and you need to get One UI 7 (Android 15) first.
What to do: 1. Use Smart Switch: Install the Samsung Smart Switch desktop program on a computer and connect your phone. This often bypasses geographical restrictions for updates. 2. Check Manually: Go to Settings > Software Update > Download and install. 3. Use a VPN: Connect to a US VPN and then check for the update.
