I have installed Windows but now I need to return to Chrome

How do I boot back into Chrome after I have flashed a full ROM update? Please help anything is appreciated.

You cannot dual boot Windows and ChromeOS with MrChromebox’s UEFI firmware.

Is it possible to return to Chrome after I have installed Windows 11 with the Full firmware flash?

In Cool Stars’s docs, it says you can but it’s a bit confusing could you explain it to me, please?
Also when I do the Full Firmware flash how many gigabytes is the ROM backup?

Cool Star’s docs: Flashing Stock Firmware | Chrultrabook Docs

They aren’t just coolstars docs. there have been a lot of people who have contributed. the rom backup won’t be more than 32 megabytes. the script should have made a backup of the stock rom.