A full port of the Galaxy M31’s One UI 3.1 firmware is now available for the Galaxy A7, A8, and A8 Plus. The ROM, dubbed “TreeUI”, has been ported by XDA Senior Member VDavid003. Apart from bumping the base Android version, the ROM also installs an Android 11-compatible vendor image, which means users can now easily boot an Android 11 GSI on these smartphones.
This includes the stock Samsung Camera app, which does not work at all, although third-party camera apps should function normally. You must first unlock the bootloader and install TWRP to flash the custom ROM on your Galaxy A7/A8/A8 Plus.
Download TreeUI based on Android 11 for the Samsung Galaxy A7/A8/A8+ 2018
Samsung Galaxy A8 smartphone runs on Android v5.1 (Lollipop) operating system. The phone is powered by Octa core (1.8 GHz, Quad core, Cortex A15 + 1.3 GHz, Quad core, Cortex A7) processor.It runs on the Samsung Exynos 5 Octa 5430 Chipset. It has 2 GB RAM and 32 GB internal storage , expandable Yes Up to 128 GB via microSD card.
Samsung Galaxy A8 smartphone has a Super AMOLED display. It measures 158 mm x 76.8 mm x 5.9 mm and weighs 151 grams. The screen has a resolution of Full HD (1080 x 1920 pixels) and 386 ppi pixel density. On camera front, the buyers get a 5 MP f/1.9, Wide Angle Primary Camera(23 mm focal length) and on the rear, there is an 16 MP camera with features like Digital Zoom, Auto Flash, Digital image stabilization, Face detection, Touch to focus. It is backed by a 3050 mAh battery. Connectivity features in the smartphone include WiFi, Bluetooth, GPS, and more.
(Source)