I tried to make a recovery flash drive in Windows 10, and I got an error message that the recovery drive is missing files, and in fact, I can't boot into the recovery environment from my hard disk. I tried restoring to an earlier Macrium Reflect image, and that didn't help. So I am not sure when the problem started. Can I rebuild it or restore it? This particular system is 1909, updated from 1903. I have a recovery flash drive with 1903, from a different computer.