You’ll have to reflash back to the original firmware. Download from https://www.creality.com/pages/download-ender-3-pro, I’m guessing “Ender-3 pro 4.2.7 mainboard firmware (32 bit)”.
FritzAdalis
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Cake day: June 12th, 2023
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1·1 year agoMaybe see if there’s a library or maker space near you with one?
Unscrewing the nozzle cold can also strip the threads in the heat block.