Update WordPress Enfold Theme Not working

The client hired another company, which entered a few codes on the site, for when someone fill the form he received this information in a spreadsheet in google drive. The site was working and he would get back to normal, then Enfold had a new update and the form disappeared, some things in the layout were were of the place. I went to enfold and updated to the latest version, then the site is back to normal, only the codes that the company entered stopped working, we contacted them and asked to show me where they were inserted the codes to see if they were gone, they entered in the header.php this script.

<script type=”text/javascript”>

function validate(){

var x= document.getElementById(‘avia_nome_1’).value;
if (x==null || x==”” || x==”Nome”)
{
alert(“Informe seu nome!”);
error = false;
return false;
}

var x= document.getElementById(‘avia_e-mail_1’).value;
if (x==null || x==”” || x==”E-mail”)
{
alert(“Digite o seu e-mail!”);
error = false;
return false;
}

var x= document.getElementById(‘avia_telefone_1’).value;
if (x==null || x==”” || x==”Telefone”)
{
alert(“Digite o seu telefone!”);
error = false;
return false;
}

return true;
}

function inputValue(){
var error;
var inputName = document.getElementById(‘avia_nome_1’).value;
var nameHidden = document.getElementById(‘nameHidden’);
nameHidden.setAttribute(‘value’, inputName);

var inputEmail = document.getElementById(‘avia_e-mail_1′).value;
var emailHidden = document.getElementById(’emailHidden’);
emailHidden.setAttribute(‘value’, inputEmail);

var inputPhone = document.getElementById(‘avia_telefone_1’).value;
var phoneHidden = document.getElementById(‘phoneHidden’);
phoneHidden.setAttribute(‘value’, inputPhone);

if (validate()) {
if (!error){

var postData = lsjQuery(‘#contatoLagoa’).serializeArray();
var formURL = lsjQuery(‘#contatoLagoa’).attr(“action”);
lsjQuery.ajax(
{
url : formURL,
type: “POST”,
data : postData,
success:function(data, textStatus, jqXHR)
{
//alert(“Contato Realizado com Sucesso!”);
},
error: function(jqXHR, textStatus, errorThrown)
{
//alert(“Contato Realizado com Sucesso!”);
}
});

lsjQuery(‘#contatoLagoa’).css(“display”, “none”);
lsjQuery(‘#ajaxresponse_1’).toggleClass(“hidden”)

window.open(‘http://residenciallagoa.com.br/residencial-lagoa/obrigado.html&#8217;,’janela’);
}
}
}

</script>

This folder is/residencial-lagoa/obrigado.html within the site as I checked on the FTP. Does anyone have any idea what could have happened?

Understand, I just want to know why when enfold updated I lost everything, layout and programming