jqGridImport is not a function
On version 5.3.2, when I try to call the jqGridImport function, it cannot be found. But jqGridExport works just fine.
$('#myGrid').jqGrid('jqGridImport', options) or $('#myGrid').jqGridImport(options)
According to the Import/Export documentation it should work just fine.
It seems to me that you use the Guriddo jqGrid, but read the old docs for jqGrid <=4.7 The correct linkt is Guriddo documentation
With simple word you will need not to apply the method to the grid, but pass the id as parameter to it. Try:
$.jgrid.jqGridImport( "#myGrid", options );