There is no Android Oreo (8.0/8.1) update for the Samsung Galaxy J2 ( SM-J200G ). This device officially stopped receiving major updates at Android 5.1.1 Lollipop.
If you are looking to replace this device, I can help you find modern budget phones that offer better performance than the J2, even if it's running a custom ROM. Samsung J2 Mobile Phone Guide: What to Know Before Buying android oreo for galaxy j2 smj200g better
Android Oreo for Galaxy J2 SM-J200G: Is It Better Than Stock Firmware? There is no Android Oreo (8
Android Oreo (8.0) has more stringent system requirements compared to earlier Android versions. The official requirements include: android oreo for galaxy j2 smj200g better