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So far there have only been 2 Android Pie updates of the Global ROM while the China beta has probably received half a dozen updates. Now updates have been suspended until the end of August so Xiaomi can update the Android base which is apparently from an early Android Pie version. I'm afraid that those of us running the developer ROM who aren't beta testers might not receive another OTA until mid September or later. And since none of the unofficial TWRP versions available for the 2S is compatible with Android Pie decryption flashing the leaked beta builds if you're not a beta tester is more of a hassle than it's worth. Kind of disappointing but I guess we have to be patient .