Accidentally changed WorldGridMaterial & now Unreal crashes at launch

Development Getting Started & Setup
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I am super new to Unreal. I modelled my first object in Unreal 5.4 and then wanted to give it a material from Quixel Mixer. So I wanted to change the WorldGridMaterial. English is not my first language so I didn’t know it’s the “overall” material. I thought it would be just a random material Unreal gives every object that you model. I renamed it to “Freezer_M”. However in the process of changing the material I saved it… and then my project crashed. Now I can’t even launch Unreal because it always crashes because it can’t load that default material.

Is there a way to change that file or to load an autosave? I was working a few weeks on that project so it would good if I could recover it…

Thanks to anyone!

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Ok. This might not be the best solution but I found a way: I was on Unreal 5.4.1 so I deleted all my Unreal projects and updated to 5.4.4 because I was hoping by doing that to get my default WorldGridMaterial back. Then I created a new project with a new modelled object that had a default WorldGridMaterial. Saved that. Recovered my old crashed project from the trash bin and started it and et voila: I could open it and the default WorldGridMaterial was back at its place.