If you own the Samsung Galaxy A7, A8, or A9 (2018), there’s good news for you today — the Wi-Fi Alliance certified all three smartphones for Android 9 Pie. That means all three of Samsung’s 2018 mid-range offerings are one step closer to the latest Android platform update.
This somewhat runs counter to Samsung’s updated software roadmap, which does not include the normal Galaxy A8 (2018). Perhaps the exclusion was a mistake on Samsung’s end, since the roadmap includes the Galaxy A8 Plus and A9.
Regardless, Samsung’s 2018 A-series smartphones are slated to get Pie in April 2019. Because the rollout might take a bit, the April 2019 timeframe might be more of a starting point for the update.
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Keep in mind that most of Samsung’s devices, including the A-series smartphones, will not get the One UI overlay — only the Galaxy S8 and S8 Plus, Note 8, S9 and S9 Plus, and Note 9 will get One UI. The overlay makes it easier to get to certain UI elements with one hand and adheres to the  round aesthetic of Pie.
The stable Pie update with One UI rolled out to the Galaxy S9 and S9 Plus in December 2018. The update isn’t available in every country yet, but it’s available in at least three countries at the time of this writing: Germany, the UAE, and Montenegro.