I get a broken page; both the backend and frontend are not loading.
I'm guessing I made a mistake while configuring a bootstrap subtheme/starterkit (using a combination of method 1 from the README file and a youtube tutorial on activating and modifying subthemes)
Right after activating it I got a "500 Server error."
I was able to load the page by replacing the modified files with the original files, but that kinda threw all previous work to the trash (I guess I can live with that), but it would still be nice to know how to manually change theme by modifying the code directly with text editor, so in the future we all can benefit from this knowledge.