Windows 10 IOT core wont boot

I got older RPI3 that works like a charm. I bought new RPI 3B+ new SandDisk class 10 SD Card and installed W10 IoT Core. I am stuck on boot screen (that colorful one) and cannot pass it.

Power supply is industrial 5V/20A supply. It must be enough for 2 RPIs. SD card is good. I tried it in older RPI, booted immediately.

Solution

Currently Raspberry Pi 3B+ is a technical preview and there is no timeline for a release version. Limited validation and enablement has been completed. You need to download the image from this link(https://www.microsoft.com/en-us/software-download/windowsiot). And then use IoT Dashboard to flush the image(*.ffu). In IoT Dashboard, please change OS Build to Custom, and then browse the ffu file to flush.