In case of an um2 you may need to use reprap g-code iso the default ulti g-code to overrule the start and end sequence. You set this in machine settings in cura. This will require you to add the start and ens g-code in cura.
Or if you use simplify3d you already do this.
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Labern 774
You can save the gcode, then open it in txt editor.
At the end of the gcode just insert the heat bed command ( I think it M104 )
You could try a small print and see if it works.
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