If you decide to upgrade your Galaxy J2 (SM-J200G) to Android Oreo, make sure to:

An upgrade to Android 8.0 Oreo can breathe new life into the aging Samsung Galaxy J2 (SM-J200G), a budget smartphone originally released with Android 5.1.1 Lollipop. While the manufacturer stopped official updates for this device years ago, the custom ROM community provides a pathway to modern software. Upgrading this specific hardware to Oreo offers distinct performance improvements, balanced by a few critical resource limitations. Performance and Memory Optimization

Flash the latest Team Win Recovery Project (TWRP) tool using Odin on a PC.

Android Oreo (8.0) has more stringent system requirements compared to earlier Android versions. The official requirements include:

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