I really didn't understand half of your problem but...The extruder feeder it's block by default until 170C it reached. To unlock and enable 'cold extrudes' send the M302 at the start of the gcode. But please don't use this if you don't know what you are doing. Also It would help if you explain the problem a bit better.
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DidierKlein 729
Well out of the box the UM2 works with 2.85mm filaments not with 1.75mm filaments
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