Mr. Chromebox, this is the same C720-2848 from which I removed the SSD, as described in this post.
I decided to try to install Chrome OS Flex on it. I have an installation flash drive.
But I can’t start booting from the flash drive. When the splash screen appears on the screen (a hare or who is it?), I press Esc and get to the menu of your firmware. If I try to go to any of the items there, I just get a black screen, and that’s it. That is, I can’t tell the laptop to boot from the flash drive.
Maybe I’m doing something wrong? Or is it impossible to install Chrome OS Flex on this laptop at all?
Aha! I know this procedure! Very good, thank you! Will do that tomorrow and return with result. (I did the same procedure under the Chrome OS, and now I have to replace Chrome OS from SSD with Ubuntu from USB flash).
I did as you said. However, I took not Ubuntu, but Xubuntu Minimal (and then I had to do apt-get update to install curl). And everything worked out! The firmware was updated, and when booting you can choose to boot from a flash drive. Chrome OS Flex was installed, now I’ll set it up. Hooray!! Thank you very much!!