Squares (tofu) appear on system update screens after uninstalling

[jyuhuan]

I uninstalled the font following the instruction repeated below

Delete or move all font files called FSText-*.otf and FSDisplay-*.otf from the /Library/Fonts folder

Everything was fine, except for when I did a system update, the following screens shows up:

How can I remedy this?

[jenskutilek]

Try to completely turn off the computer once. Something of the fonts seems to stay present even across simple reboots.

[jyuhuan]

Do you know a best way to "completely turn off the computer", @jenskutilek ? I have already done it many times by selecting the "shut down" option from the Mac menu.

[jenskutilek]

Shut down should do it ... Are there by any chance older or duplicate versions of the fonts in another fonts folder, e.g. in your user folder (/Users/username/Library/Fonts)? These should be deleted as well. You could also try to boot in safe mode, keeping the shift key pressed during boot, to clear all font caches.