#1273 – Unknown collation: ‘utf8mb4_unicode_520_ci’
1) Click the “Export” tab for the database
2) Click the “Custom” radio button
3) Go the section titled “Format-specific options” and change the dropdown for “Database system or older MySQL server to maximize output compatibility with:” from NONE to MYSQL40.
4) Scroll to the bottom and click “GO”.
I’m not certain if doing this causes any data loss, however in the one time I’ve tried it I did not notice any. Neither did anyone who responded in the forums linked to above.
Reference
http://stackoverflow.com/questions/29916610/1273-unknown-collation-utf8mb4-unicode-ci-cpanel/29939906#29939906