Samsung Galaxy J2 (SM-J200G) , released in 2015, did not receive an official Android Oreo (8.0/8.1)
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While Android Oreo offers major software enhancements, it is important to remember the physical constraints of the Samsung Galaxy J2 SM-J200G : Exynos 3475 Quad-core 1.3 GHz ARM Cortex-A7 RAM: 1 GB Storage: 8 GB internal (expandable via MicroSD) Display: 4.7-inch Super AMOLED (540 x 960 pixels) Battery: 2000 mAh
The Galaxy J2 (SM-J200G) is a relatively old device, and its hardware specifications may not meet the requirements for running Android Oreo smoothly. However, there are custom Android Oreo ROMs available for the device, which can be installed to upgrade the operating system.
Android 5.1.1 Lollipop (never officially updated past this).