Get into Developer Mode as described in https://www.chromium.org/chromium-os/developer-information-for-chrome-os-devices/samsung-series-5-chromebook Download firmware from MrChromebox.tech. There’s more instructions there and elsewhere on the web, even another site or two for the boot firmware. (try Github)
But I’m going to stop there, because the solid state drive is far too small to do anything useful with Win10, or nearly any other operating system. It’s painfully slow and buggy. You might try Gallium linux, or Chromium (the open source version of ChromeOS), but still… this is mainly learning exercise, and a bigger hazard than bricking, because; Yes, its doable, but the results are disappointing. Fortunately this Chromebook is cheap enough compared other notebooks that you might want to try it, but don’t expect premium online games to work.