Over a year after going on sale, the first-gen Asus ROG Phone is now receiving the Android Pie update. Yes, you read that correctly; Pie, not Android 10. The rollout is a staged one and the OTA will get to all users of the device over the next few days.
https://www.notebookcheck.net/The-first-generation-Asus-ROG-Phone-is-finally-receiving-the-Android-Pie-update.445013.0.html