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There is no fix for Intel’s crashing 13th and 14th Gen CPUs — any damage is permanent
(www.theverge.com)
This is a most excellent place for technology news and articles.
If you're in the UK or I expect EU, I imagine if it's due to oxidation you can get it replaced even on an expired warranty as it's a defect which was known to either you or intel before the warranty expired, and a manufacturing defect rather than breaking from use, so intel are pretty much in a corner about having sold you faulty shit