Dell notebook made several hardware checks. When you click Y and N, you clicked the wrong number, and then you made an error. Now EVENT LOG in EPSA has been showing warnings. How can this log be deleted clean? Previously, some people said that using the desktop version of unbutu to boot into the Linux system, delete the DIAG... xxxxxx... file under / sys / firmware / EFI / efivars /. However, it was found that neither the file nor the parent folder was authorized to write.