When the "new update is available" popup appears on the screen, does the os go to the manufacturer's server or the google's servers to download the update? in other words who is the main version update publisher that the os looks for updates from?

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    Always the manufacturer provides the updates. – Robert Oct 13 '19 at 13:32
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    You can actually figure this out by yourself by intercepting the network request from your OS updater software/app. We have related posts if you need help with that. – Firelord Oct 13 '19 at 13:55

The OS looks for updates from the manufacturer's site for a newer version. When you click download on your phone it download the latest update usually as "update.zip".

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