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I think you're going to need to tell us a little more about what you're trying to do here. OTA servers are possible, Google, some manufacturers, and some phone networks all run their own, I believe there's even some custom ROMs (CM?) that can do OTA now. Nothing particularly complicated about the server end (an HTTP interface that can version check and serve large binaries is pretty much all it actually does), there is no built-in way to get a device to check and trust a 3rd party server for updates, this would need to be baked in to the ROM. Then there's actually updating the device...