Já corri o código no phpmyadmin
UPDATE `smf_boards` SET `description` = REPLACE(`description`, '³', 'ł');
UPDATE `smf_boards` SET `description` = REPLACE(`description`, 'ó', 'ó');
UPDATE `smf_boards` SET `description` = REPLACE(`description`, 'ê', 'ę');
UPDATE `smf_boards` SET `description` = REPLACE(`description`, '¶', 'ś');
UPDATE `smf_boards` SET `description` = REPLACE(`description`, '±', 'ą');
UPDATE `smf_boards` SET `description` = REPLACE(`description`, 'æ', 'ć');
UPDATE `smf_boards` SET `description` = REPLACE(`description`, 'ñ', 'ń');
UPDATE `smf_boards` SET `description` = REPLACE(`description`, '£', 'Ł');
UPDATE `smf_boards` SET `description` = REPLACE(`description`, '¦', 'Ś');
UPDATE `smf_boards` SET `description` = REPLACE(`description`, 'ê', 'ę');
UPDATE `smf_boards` SET `description` = REPLACE(`description`, '¿', 'ż');
UPDATE `smf_boards` SET `description` = REPLACE(`description`, '¡', 'Ą');
UPDATE `smf_boards` SET `name` = REPLACE(`name`, '³', 'ł');
UPDATE `smf_boards` SET `name` = REPLACE(`name`, 'ó', 'ó');
UPDATE `smf_boards` SET `name` = REPLACE(`name`, 'ê', 'ę');
UPDATE `smf_boards` SET `name` = REPLACE(`name`, '¶', 'ś');
UPDATE `smf_boards` SET `name` = REPLACE(`name`, '±', 'ą');
UPDATE `smf_boards` SET `name` = REPLACE(`name`, 'æ', 'ć');
UPDATE `smf_boards` SET `name` = REPLACE(`name`, 'ñ', 'ń');
UPDATE `smf_boards` SET `name` = REPLACE(`name`, '£', 'Ł');
UPDATE `smf_boards` SET `name` = REPLACE(`name`, '¦', 'Ś');
UPDATE `smf_boards` SET `name` = REPLACE(`name`, 'ê', 'ę');
UPDATE `smf_boards` SET `name` = REPLACE(`name`, '¿', 'ż');
UPDATE `smf_boards` SET `name` = REPLACE(`name`, '¡', 'Ą');
UPDATE `smf_members` SET `member_name` = REPLACE(`member_name`, '³', 'ł');
UPDATE `smf_members` SET `member_name` = REPLACE(`member_name`, 'ó', 'ó');
UPDATE `smf_members` SET `member_name` = REPLACE(`member_name`, 'ê', 'ę');
UPDATE `smf_members` SET `member_name` = REPLACE(`member_name`, '¶', 'ś');
UPDATE `smf_members` SET `member_name` = REPLACE(`member_name`, '±', 'ą');
UPDATE `smf_members` SET `member_name` = REPLACE(`member_name`, 'æ', 'ć');
UPDATE `smf_members` SET `member_name` = REPLACE(`member_name`, 'ñ', 'ń');
UPDATE `smf_members` SET `member_name` = REPLACE(`member_name`, '£', 'Ł');
UPDATE `smf_members` SET `member_name` = REPLACE(`member_name`, '¦', 'Ś');
UPDATE `smf_members` SET `member_name` = REPLACE(`member_name`, 'ê', 'ę');
UPDATE `smf_members` SET `member_name` = REPLACE(`member_name`, '¿', 'ż');
UPDATE `smf_members` SET `member_name` = REPLACE(`member_name`, '¡', 'Ą');
UPDATE `smf_members` SET `signature` = REPLACE(`signature`, '³', 'ł');
UPDATE `smf_members` SET `signature` = REPLACE(`signature`, 'ó', 'ó');
UPDATE `smf_members` SET `signature` = REPLACE(`signature`, 'ê', 'ę');
UPDATE `smf_members` SET `signature` = REPLACE(`signature`, '¶', 'ś');
UPDATE `smf_members` SET `signature` = REPLACE(`signature`, '±', 'ą');
UPDATE `smf_members` SET `signature` = REPLACE(`signature`, 'æ', 'ć');
UPDATE `smf_members` SET `signature` = REPLACE(`signature`, 'ñ', 'ń');
UPDATE `smf_members` SET `signature` = REPLACE(`signature`, '£', 'Ł');
UPDATE `smf_members` SET `signature` = REPLACE(`signature`, '¦', 'Ś');
UPDATE `smf_members` SET `signature` = REPLACE(`signature`, 'ê', 'ę');
UPDATE `smf_members` SET `signature` = REPLACE(`signature`, '¿', 'ż');
UPDATE `smf_members` SET `signature` = REPLACE(`signature`, '¡', 'Ą');
UPDATE `smf_members` SET `location` = REPLACE(`location`, '³', 'ł');
UPDATE `smf_members` SET `location` = REPLACE(`location`, 'ó', 'ó');
UPDATE `smf_members` SET `location` = REPLACE(`location`, 'ê', 'ę');
UPDATE `smf_members` SET `location` = REPLACE(`location`, '¶', 'ś');
UPDATE `smf_members` SET `location` = REPLACE(`location`, '±', 'ą');
UPDATE `smf_members` SET `location` = REPLACE(`location`, 'æ', 'ć');
UPDATE `smf_members` SET `location` = REPLACE(`location`, 'ñ', 'ń');
UPDATE `smf_members` SET `location` = REPLACE(`location`, '£', 'Ł');
UPDATE `smf_members` SET `location` = REPLACE(`location`, '¦', 'Ś');
UPDATE `smf_members` SET `location` = REPLACE(`location`, 'ê', 'ę');
UPDATE `smf_members` SET `location` = REPLACE(`location`, '¿', 'ż');
UPDATE `smf_members` SET `location` = REPLACE(`location`, '¡', 'Ą');
UPDATE `smf_personal_messages` SET `body` = REPLACE(`body`, '³', 'ł');
UPDATE `smf_personal_messages` SET `body` = REPLACE(`body`, 'ó', 'ó');
UPDATE `smf_personal_messages` SET `body` = REPLACE(`body`, 'ê', 'ę');
UPDATE `smf_personal_messages` SET `body` = REPLACE(`body`, '¶', 'ś');
UPDATE `smf_personal_messages` SET `body` = REPLACE(`body`, '±', 'ą');
UPDATE `smf_personal_messages` SET `body` = REPLACE(`body`, 'æ', 'ć');
UPDATE `smf_personal_messages` SET `body` = REPLACE(`body`, 'ñ', 'ń');
UPDATE `smf_personal_messages` SET `body` = REPLACE(`body`, '£', 'Ł');
UPDATE `smf_personal_messages` SET `body` = REPLACE(`body`, '¦', 'Ś');
UPDATE `smf_personal_messages` SET `body` = REPLACE(`body`, 'ê', 'ę');
UPDATE `smf_personal_messages` SET `body` = REPLACE(`body`, '¿', 'ż');
UPDATE `smf_personal_messages` SET `body` = REPLACE(`body`, '¡', 'Ą');
UPDATE `smf_personal_messages` SET `subject` = REPLACE(`subject`, '³', 'ł');
UPDATE `smf_personal_messages` SET `subject` = REPLACE(`subject`, 'ó', 'ó');
UPDATE `smf_personal_messages` SET `subject` = REPLACE(`subject`, 'ê', 'ę');
UPDATE `smf_personal_messages` SET `subject` = REPLACE(`subject`, '¶', 'ś');
UPDATE `smf_personal_messages` SET `subject` = REPLACE(`subject`, '±', 'ą');
UPDATE `smf_personal_messages` SET `subject` = REPLACE(`subject`, 'æ', 'ć');
UPDATE `smf_personal_messages` SET `subject` = REPLACE(`subject`, 'ñ', 'ń');
UPDATE `smf_personal_messages` SET `subject` = REPLACE(`subject`, '£', 'Ł');
UPDATE `smf_personal_messages` SET `subject` = REPLACE(`subject`, '¦', 'Ś');
UPDATE `smf_personal_messages` SET `subject` = REPLACE(`subject`, 'ê', 'ę');
UPDATE `smf_personal_messages` SET `subject` = REPLACE(`subject`, '¿', 'ż');
UPDATE `smf_personal_messages` SET `subject` = REPLACE(`subject`, '¡', 'Ą');
UPDATE `smf_messages` SET `body` = REPLACE(`body`, '³', 'ł');
UPDATE `smf_messages` SET `body` = REPLACE(`body`, 'ó', 'ó');
UPDATE `smf_messages` SET `body` = REPLACE(`body`, 'ê', 'ę');
UPDATE `smf_messages` SET `body` = REPLACE(`body`, '¶', 'ś');
UPDATE `smf_messages` SET `body` = REPLACE(`body`, '±', 'ą');
UPDATE `smf_messages` SET `body` = REPLACE(`body`, 'æ', 'ć');
UPDATE `smf_messages` SET `body` = REPLACE(`body`, 'ñ', 'ń');
UPDATE `smf_messages` SET `body` = REPLACE(`body`, '£', 'Ł');
UPDATE `smf_messages` SET `body` = REPLACE(`body`, '¦', 'Ś');
UPDATE `smf_messages` SET `body` = REPLACE(`body`, 'ê', 'ę');
UPDATE `smf_messages` SET `body` = REPLACE(`body`, '¿', 'ż');
UPDATE `smf_messages` SET `body` = REPLACE(`body`, '¡', 'Ą');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, '¡', 'Ą');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, '³', 'ł');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, 'ó', 'ó');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, 'ê', 'ę');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, '¶', 'ś');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, '±', 'ą');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, 'æ', 'ć');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, 'ñ', 'ń');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, '£', 'Ł');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, '¦', 'Ś');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, 'ê', 'ę');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, '¿', 'ż');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, '¡', 'Ą');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, '³', 'ł');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, 'ó', 'ó');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, 'ê', 'ę');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, '¶', 'ś');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, '±', 'ą');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, 'æ', 'ć');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, 'ñ', 'ń');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, '£', 'Ł');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, '¦', 'Ś');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, 'ê', 'ę');
UPDATE `smf_messages` SET `subject` = REPLACE(`subject`, '¿', 'ż');
UPDATE `smf_polls` SET `question` = REPLACE(`question`, '³', 'ł');
UPDATE `smf_polls` SET `question` = REPLACE(`question`, 'ó', 'ó');
UPDATE `smf_polls` SET `question` = REPLACE(`question`, 'ê', 'ę');
UPDATE `smf_polls` SET `question` = REPLACE(`question`, '¶', 'ś');
UPDATE `smf_polls` SET `question` = REPLACE(`question`, '±', 'ą');
UPDATE `smf_polls` SET `question` = REPLACE(`question`, 'æ', 'ć');
UPDATE `smf_polls` SET `question` = REPLACE(`question`, 'ñ', 'ń');
UPDATE `smf_polls` SET `question` = REPLACE(`question`, '£', 'Ł');
UPDATE `smf_polls` SET `question` = REPLACE(`question`, '¦', 'Ś');
UPDATE `smf_polls` SET `question` = REPLACE(`question`, 'ê', 'ę');
UPDATE `smf_polls` SET `question` = REPLACE(`question`, '¿', 'ż');
UPDATE `smf_polls` SET `question` = REPLACE(`question`, '¡', 'Ą');
UPDATE `smf_poll_choices` SET `label` = REPLACE(`label`, '³', 'ł');
UPDATE `smf_poll_choices` SET `label` = REPLACE(`label`, 'ó', 'ó');
UPDATE `smf_poll_choices` SET `label` = REPLACE(`label`, 'ê', 'ę');
UPDATE `smf_poll_choices` SET `label` = REPLACE(`label`, '¶', 'ś');
UPDATE `smf_poll_choices` SET `label` = REPLACE(`label`, '±', 'ą');
UPDATE `smf_poll_choices` SET `label` = REPLACE(`label`, 'æ', 'ć');
UPDATE `smf_poll_choices` SET `label` = REPLACE(`label`, 'ñ', 'ń');
UPDATE `smf_poll_choices` SET `label` = REPLACE(`label`, '£', 'Ł');
UPDATE `smf_poll_choices` SET `label` = REPLACE(`label`, '¦', 'Ś');
UPDATE `smf_poll_choices` SET `label` = REPLACE(`label`, 'ê', 'ę');
UPDATE `smf_poll_choices` SET `label` = REPLACE(`label`, '¿', 'ż');
UPDATE `smf_poll_choices` SET `label` = REPLACE(`label`, '¡', 'Ą');
UPDATE `smf_members` SET `real_name` = `member_name`;