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1- Rename the folder mysql/data to mysql/data_old (you can use any name)

2- Create a new folder mysql/data

3- Copy the content that resides in mysql/backup to the new mysql/data folder

4- Copy all your database folders that are in mysql/data_old to mysql/data (skipping the mysql, performance_schema, and phpmyadmin folders from data_old)

5-Finally copy the ibdata1 file from mysql/data_old and replace it inside mysql/data folder

6-Start MySQL from XAMPP control panel