1. if i fail to test a theme from WSB i reboot my pc 2 times when windows logo appears i shut it down, and the Automatic Repair screen appears i go to Advanced Settings/Options, and choose Command Prompt, i run notepad from there and i press File>Open, down there i choose "All Files" and i go to
C:\ProgramData\Windows Style Builder\Testingand delete all files from there
2. if i was a noob and put the theme in the Themes folder not even testing it in WSB and apply it from Windows theme Settings and i got a blank screen too, i reboot my pc 2 times when windows logo appears i shut it down, and the Automatic Repair screen appears i go to Advanced Settings/Options, and choose Command Prompt, i run notepad from there and i press File>Open, down there i choose "All Files" and i go to This PC then on partition where is Windows and then in
\Windows\Resources\Themesand i copy the aero.msstyles from aero folder then i copy it in my broken theme folder, delete the broken .msstyles and paste aero.msstyles there and rename it accordingly to that old deleted .msstyles theme , and i reboot, i don't need to do system restore points and wait a lot of time