MySQL Users are gone (lost) after a MySQL 5.5 update in MS Windows
(Doc ID 2346803.1)
Last updated on APRIL 03, 2018
Applies to:MySQL Server - Version 5.7 and later
Information in this document applies to any platform.
After Updating MySQL 5.5 to a newer version using the .msi installer (for example: mysql-advanced-5.5.58-winx64.msi) all the existing MySQL users and gone, and it's not possible to login into MySQL even using the root account
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