Editting multiple prefabs in editor via script

I’m sorry you’ve had this issue. Please consider using source control in order to guard and protect your hard-earned work.

Personally I use git because it is free and there are tons of tutorials out there to help you set it up.

Here’s how I use git in one of my games, Jetpack Kurt:

Using fine-grained source control as you work to refine your engineering:

Share/Sharing source code between projects:

For this issue, here is how to solve:

  • get your project into source control NOW

  • make a fresh HDRP project the same way you did originally

  • copy the files from the new empty project to your current project

  • keep using source control to avoid unpleasant future surprises like this.