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I have a problem related this and this question. I began updating a long time ago (2017?) and got the error "Craft CMS does not support backtracking to this version. Please upload Craft CMS 0 or later" when I try to access the site or admin. I'm just now trying to fix it. I have tried replacing the app folder with a clean craft 2 version and I'm getting a blank white screen on everything.

I run a local install and a live install from the same DB.

What else can I try?

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2 Answers 2

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Turns out I hadn't fully uploaded the app folder when I tried to access it earlier. Tried again, made sure it was finished before renaming and it worked fine.

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I have the same error and used an older dump. I was, later on, able to access the admin panel.

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