4.1.2 Installation error

I had 4.1.2 version installed and tried to install the 4.2 test version. I failed, it printed some “Installer errors encountered during boot” error-block and I tried to install the freshly downloaded 4.1.2, but it failed too with an error of: “Warning: dracut-initqueue timeout - starting timeout scripts” repeating over and over and finally printed:
Starting dracut emergynce shell…
warning: /dev/root does not exist
Generating “/run/initramfs/rdsosreport.txt”
Entering emergency mode. exist the shell to continue

Any idea what the heck is that and why suddenly I’m facing this?

how you make the installation medium?
have you try using other flashdive?

From what I was able to find it can actually be a bad USB stick, but did you try maybe read what’s in the rdsosreport.txt? or is it empty? I also find this, maybe it will help you: How to debug Dracut problems :: Fedora Docs