Boot repair help

I have a Librem 15 laptop, but didn’t get a Librem Key until after the laptop purchase. I had a dual boot setup with PureOs and Qubes which was working very well. I foolishly did a copy operation that was slightly off and corrupted the boot environment.

I can boot to PureOs, but the Qubes partition is unreachable. I’ve simply been using PureOS, and like it, but would like to get the Qubes environment back.

I’d need a fairly simple solution. I’m not confident using grub for repair. The boot-repair-disk tool touted by many and found primarily on source forge doesn’t seem to work.