https://wccftech.com/third-windows-10-cu-is-now-available-for-build-21390/ > W10 Wallpaper Theme: "Colorful Boats" > Microsoft has released another Windows 10 cumulative update for Insiders in the Dev Channel. Cumulative Update Build 21390.2025 (KB5004123) doesn't bring anything new and is being released to test the servicing pipeline.