I’ve installed fedora latest version on an external hard drive, working like a charm as long as I update fedora using dnf, the system won’t boot after that.
I always face the same situation when booting, it gives me options for different versions of fedora:
it’s so strange tho, just updated the system and faced the same issue. However I’ll try to make this change permanent as you mentioned above but any idea why and how this happens?
Depending on where in the boot process the error occurs, the system journal may have details. See journalctl Command in the Linux Handbook. You will want to look at the previous boots that failed.
Your chances of getting useful help will be better if you post enough detail to allow others with similar hardware to reproduce the issue. Start by posting the output from inxi Fzxx (as pre-formatted text so it can be found with web searched).