Finally, Android 10 Q is official and so the AOSP 10 Source code. Samsung Galaxy S8 Plus (dream2lte) is now getting the unofficial version of Lineage OS 17.1 developed by Stricted Recognized Developer on XDA forum. The device is launched on March 2017. The handset came with Android 7.0 Nougat. Now you can enjoy Lineage OS 17.1 based on Android 10. Full credits to him and Lineage team. Now you can install Lineage OS 17.1 on Galaxy S8 Plus which is stable enough to use as a daily driver.
Android 10 is Google’s 10th version of Android OS with plenty of new features and system UI changes. Google doesn’t come with any dessert item name for the new Android version this time and that’s a good move. If you’re new to the Android ecosystem, it’s worth mentioning that Android is an Open Source Project (AOSP) by Google. With the new released Android 10 source code, the Lineage team has started working on Lineage OS 17.1 for all the supported device.
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To install Lineage OS 17.1 on your Galaxy S8 Plus, you need to unlock bootloader and running latest TWRP Recovery. If you are on the old version, you will see error 7 warning text while installing the custom ROM on Galaxy S8 Plus device.

What’s on Android 10 version?
Google has officially unveiled the latest version of Android OS called Android 10. The update is already going live for Pixel series devices. It brings plenty of new features to the device system like system UI, new gesture navigation, improved privacy and location control. The update also offers enhanced app permissions, foldable display support, security features, system-wide dark mode, etc.
The msm variant of s8 is locked in eu only the exynos one is unlockable