[High Sierra] Tried updating to 10.13.6 and stuck at “End RandomSeed” after reboot

Hi all, I had just finished installed High Sierra 10.13.3 on my Ryzen 2600 based system. Everything works flawlessly without any issues whatsoever.

However, I tried installing any version of Final Cut Pro X and it completely refused to work whatsoever. So I ended up following a guide that explained to reboot and to choose “Boot from InstallOSX from .....” to install the update, but unfortunately, it seems like it gets stuck on “End RandomSeed”.

Have I somehow missed a step ? I followed the guide which was made for Hackintosh, that said to simply update from the AppStore.

Thank you all in advance