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Issues with alarm 2 solved, video how to calibrate ugs

Hi Guys
ive set my home position at the front left hand corner of the machine when i home it, its all good. When i load a file to cut it goes haywire. I get the error code in the pic

So when i check my settings from the setup wizard when i try to change $21 to 0 then save and close it always fails to set the 0 and reverts to 1 for hard limits as well.
i tried posting the series of images from the set up wizardbut i can only post 1 image
hoping someone can help this is doing my head in
Thanks in advance

this is what i get with the soft limits after following instructions

i found the solution with this you tube video on setting up ugs with a machine
ugs calibration