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What method did you use? I might have another go at it, just don’t fancy spending ages. What is 155a EDC?
Just tested each core in - 5 steps each time and started at 170a EDC, EDC is in with all the other settings but there's an auto setting that needs to be set to manual to reveal the EDC parameters that you need to change. Really simple. I probably have a good chip but I would expect most of them to be capable of doing something with these settings.