I'm using Nextion Displays since a while and didn't had any big issues since today. I've updated the Editor to newest version 1.68.1 and by uploading my pages it did upgrade display firmware to version S115. Now all labels are hidden. I've changed display and happened the same, also changing model. I've made a simple test page with text, buttons and images, I see button frames, images but no text, no labels. Button animation works, also clicks to change pages works, but no text/labels displayed.

I've also uploaded tft files via SD card on different display, same issue.

Anyone has the same issue? How do I downgrade to older firmware?