MySQL. How to convert latin to utf8?

Question

MySQL

In general, such a problem. Users entered the database of various Cyrillic words. And the encoding of the table was latin. In time it did not trace now all the information in the database in the form of question marks. Like this: "????? - ???????? ???".
How can I translate these question marks into Cyrillic?
I could not google something on my problem (just when the text became in the form of question marks).

Answer 1

I made a dump, converted it to utf-8 and uploaded it back.

Answer 2

Unfortunately, the built-in MySQL tools do not. Or through a backup or a script that makes elementary steps - select -> delete -> decode -> encode -> insert.