[Scandal]

Well, I found a hard-coded solution.

1. Open the exported xml with Notepad++
2. Convert it to UTF-8 (Encoding > Encode in UTF-8 > Save)
3. Open file /includes/class_xml.php, then find:

PHP Code:

$xml_encoding = (($in_encoding != 'UTF-8' OR strtoupper($stylevar['charset']) != 'UTF-8') ? 'ISO-8859-1' : 'UTF-8'); 


4. Add below:

PHP Code:

$target_encoding = 'UTF-8';
$xml_encoding = 'UTF-8'; 


5. Then try to import *xml product via AdminCP.

All ok!

6. Undo step #4.

Done