The OB55 Advance Server opened on August 21, 2026. Selected players can download the test APK, enter with an activation code, and try features that are still under development. The testing window is scheduled to continue until early or mid-September. After that, the full OB55 update is expected to roll out globally between September 9 and September 16, 2026, with many sources pointing toward mid-September as the most likely period.