WordPress Error: Unknown collation: 'utf8mb4_unicode_ci'

This error happens on migrating the database from Mysql 5.5.3+ to older versions. We can solve this problem by following the steps below.

Step1: Login to phpmyadmin.

Step2: Select custom method for export.

Step3: Select MYSQL40 from the dropdown.

Step4: Export.

That's all…

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