Wrong chars using PDO ODBC connection to DB2 on Windows - windows

Question

I’m setting up a new server, and I'm updating some old script (PHP 5+) to PHP 7.
I'm connecting to a DB2 database via PDO ODBC and reading a CHAR field with CCSID 870 and saving it on a MySQL mediumtext field in a table with CHARSET=utf8. But i got wrong characters on MySQL database and event in PHP console.
I tried to switch to odbc_connect() like the old script but the results was the same.
Even saving the field in a txt file the results is the same.
utf8_encode & utf8_decode doesn't help.
Here an example of code:
$as = new PDO("odbc:MYODBC",$user, $psw);
$as->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
$res = $as->query("SELECT FIELD FROM MYTABLE");
$rows = $res->fetchAll();
$mysql = new PDO("mysql:host=srvip;dbname=mydbname;charset=utf8",$user, $psw);
$mysql->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$mysql->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
$mysql->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
$ins = $mysql->prepare("INSERT INTO my_MySQL_TABLE (FIELD) VALUES (?)");
$ins->execute(array(trim($rows[0]["FIELD"])));
I expect the results on MySQL to be Wąż, but the actual output is W?? or WÈØ.
Edit on 2019-06-06
| Source | String | HEX |
|------------------|--------|------------|
| DB2 | Wąż | E6A0B2 |
| MySQL | W?? | 573F3F |
| MySQL C/P Insert | Wąż | 57C485C5BC |
The last version is a simple copy-paste to MySQL using a GUI
Edit on 2019-06-07
C:\Users\ME\>echo %DB2CODEPAGE%
1208
C:\Users\ME\>acs.exe /PLUGIN=cldownload /system=MYSYS /sql="SELECT FIELD as char,HEX(FIELD) as hex FROM TABLE" /display=1
CHAR HEX
W?? E6A0B2
If I use /clientfile=test.txt instead of /display=1 Notepad++ show me the file as UTF-8