Take the cutting side of the Halberd Spudger and place it in-between the flex cable and digitizer.

Gently separate the flex cable from the digitizer by bringing the spudger towards the home button

Heat shouldn't be required but may help loosen the adhesive if you are finding it a bit difficult to separate the flex cable from the digitizer

Once the spudger is near the part of the cable that rested on the bracket, pause. Adjust the spudger so that way you can now separate the flex cable from the bracket without damaging the flex cable

Be careful not to tug, twist, tear, or otherwise break the flex cable to the home button. Again, this will cause irreparable damage to the touch ID and home button.