ECSDalMgr.ECSModule.updateItemRequest(old_data.__metadata.uri, new_data, old_data.__metadata.etag, 'true').then(function(data){
                ECSDalMgr.LoadScripts(listGUID, itemID , REMINDERworkflowSubscriptionID , "");
                Utilities.closeWaitScreenDialogBox();
                Utilities.closeModalPopUp();
        }).fail(function (error) { console.log("Error in getItemById" + error.responseText) });

this.LoadScripts = function (lstguid, listItemId, subscriptionID, Url) {
    listGUID = lstguid;
    itemID = listItemId;
    workflowSubscriptionID = subscriptionID;
    redirectUrl = Url;
    SP.SOD.executeFunc("sp.js", "SP.ClientContext", function () {
        SP.SOD.registerSod('sp.workflowservices.js', SP.Utilities.Utility.getLayoutsPageUrl('sp.workflowservices.js'));
        SP.SOD.executeFunc('sp.workflowservices.js', "SP.WorkflowServices.WorkflowServicesManager", startWorkflow);
    })
}

function startWorkflow() {
    getWorkflow(listGUID, itemID, workflowSubscriptionID, redirectUrl);
}

function getWorkflow(lstGuid, itemID, workflowSubscriptionID, redirectToUrl) {
var context = SP.ClientContext.get_current();
var web = context.get_web();
var sMgr = new SP.WorkflowServices.WorkflowServicesManager.newObject(context, web);
var subscription = sMgr.getWorkflowSubscriptionService().getSubscription(workflowSubscriptionID);
context.load(subscription);
context.executeQueryAsync(
    function (sender, args) {
        var params = new Object();
        var formData = subscription.get_propertyDefinitions()["FormData"];
        if (formData != null && formData != 'undefined' && formData != "") {
            var assocParams = formData.split(";#");
            for (var i = 0; i < assocParams.length; i++) {
                params[assocParams[i]] = subscription.get_propertyDefinitions()[assocParams[i]];
            }
        }
        if (itemID) {
            sMgr.getWorkflowInstanceService().startWorkflowOnListItem(subscription, itemID, params);
        }
        else {
            sMgr.getWorkflowInstanceService().startWorkflow(subscription, params);
        }
        context.executeQueryAsync(
                function (sender, args) {

                },
                errFunc);
    },
    errFunc);
}

function errFunc(sender, args) {
    alert("Error: unable to start workflow")
    console.log('Error: unable to start workflow' + error.responseText);
}

ECSDalMgr.ECSModule.updateItemRequest([your params]).then(function (data) {
    ECSDalMgr.LoadScripts(listGUID, itemID, REMINDERworkflowSubscriptionID, "")).then(function () {
        Utilities.closeWaitScreenDialogBox();
        Utilities.closeModalPopUp();
    }).fail(function (error) { console.log("Error in getItemById" + error.responseText);