First thing to do is to figure out is what is wrong. MySQL is usually quite easy with UTF8 and myDBR has no problems with diacritics. Most likely there is a configuration problem in server or the data is stored incorrectly.
Open the SQL Editor and excute following commands.
The hex value for ł in Paweł should be C582. So
select hex(ord('ł'))
Should return C582
as should (modify to match your data)
select hex(ord(reverse(first_name))) from mydb.persons;
To see full description of your settings:
SHOW VARIABLES LIKE 'character_set%';
SHOW VARIABLES LIKE 'collation%';
And to see config of your table's column holding the data (modify to match your data):
SELECT CHARACTER_SET_NAME, COLLATION_NAME
FROM information_schema.COLUMNS
C
WHERE table_schema = 'mydb'
AND table_name = 'mytable'
AND column_name = 'mycolumn';
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myDBR Team