Datatype : 'jsonstring' is ignoring totalpages and totalrecord in jqgird version 5.2.1

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Javascript

jQuery

JQGrid

I have recently upgraded my jqgrid from version 3 to 5.2.1, While doing so i faced unique problem while returning data from server side.

what i want, i am sending only 80 record from server side,with total records of 280, page=1 ad totalpage=4, but my jqgrid always show page 1 of 1 and displaying View 1 - 80 of 80 records, and rownum is 80.

it should display 1-80 from 280 and page 1 of 4.

Seems like my jqgrid ignoring the totalpages and totalrrecords.

Here is my jqgrid code:

jQuery("#tradeList").jqGrid(
{
jsonReader : {
        id : "0"
    },
    url : 'getDetailAgingReportInternal.go',
    datatype : 'jsonstring',
    mtype : 'POST',
    datastr : '{"page":' + data.page + ',"total":'
            + data.totalPages + ',"records":' + data.total
            + ',"rows": ' + data.rowData + '}',
    colModel : data.colModel,
    pager : '#pagerTrade',
    rowNum : data.records,
    rowList : [ 80, 160, 240 ],
    viewrecords : true,
    height: "350",
    width : "auto",
    viewsortcols : [ true, 'vertical', true ],
    multiselect : data.multiselect,
    multiboxonly: true,
    onPaging : function(pgButton) {
        var pageNo = getPageNo("tradeList");
        var rowCount = getRowCount("tradeList");

        loadDetailAgingReport(1, postData.bucketType, postData.mode, postData.modeType, '', '', postData.entity, 
                            '', postData.entityId, postData.statusTypeId, postData.tradeTypeIdJson, postData.isOTC, 
                            pageNo, rowCount, '', false, false);

        return 'stop';
    },
    onSortCol : function(index, columnIndex, sortOrder) {
        //alert("index:"+index+", columnIndex:" +columnIndex + ", sortOrder:" +sortOrder);
        var colSort = {};
        colSort.index = getColumnIndex("tradeList", columnIndex);
        colSort.direction = sortOrder;
        var colSortList = [ colSort ];
        var pageNo = getPageNo("tradeList");
        var rowCount = getRowCount("tradeList");

        loadDetailAgingReport(1, postData.bucketType, postData.mode, postData.modeType, postData.colHeader, postData.statusType, postData.entity, 
                postData.colName, postData.entityId, postData.statusTypeId, postData.tradeTypeIdJson, postData.isOTC, 
                pageNo, rowCount, colSortList, false, false);

        return 'stop';
    },
gridComplete:function(){

}
});

What I have tried:

I have tried every solution possible in any site, since i dont want to change my code much, expecting a solution with minimum changes.