You can update a record in Zoho CRM using the updateRecord() Deluge task.
Syntax
<map-variable> = zoho.crm.updateRecord(<CRM Module Name>, <ID> , <New values as map object>);
where,
<map-variable> is the xml string returned by CRM.
<CRM Module Name> is the name of the CRM module where the record will be updated. Forexample, "Leads" refers to the Leads module.
<ID> is the ID of the CRM record to be updated
<map variable> is the map variable that holds the key,value pairs. The map key is the label name as specified in the CRM module and the map value is the field value as submitted in the ZC form. For example, "Company" : input.Company_Name . Here, "Company" is the label name of the crm module and input.Company_Name refers to the value specified in the Company_Name field in the Zoho Creator form.
resp = zoho.crm.updateRecord("Leads","11234000002",{"Phone":2943885,"Department":"Admin","Task Owner" : input.Owner_Name, "SMOWNERID" : input.Owner_ID});
You can define the upgraderecord() task using Script Builder by following the steps given below:

crmResp = zoho.crm.updateRecord("Tasks", input.task_ID, { "Status" : "In Progress","Task Owner" : input.Owner_Name, "SMOWNERID" : input.Owner_ID, "SEMODULE" : "Accounts", "SEID" : input.Account_ID, "CONTACTID" : input.Contact_ID});