See a copy attached of the 64k Winbond-Eeprom.
However, not knowing if the Winbond-data might be corrupted I burned the EightyOne overlay file on it but unluckily the ZXpand+ behaves not working the same way as before...

Ah, I can't upload the file, getting the error code "Invalid file extension" trying ". ROM", ". OVL" and ". zip".