I found another site that said temps of 203F/95C were required to soften the glues. Once I started using those temps with my heat gun, as well as a tool I made by just cutting the flat front/back panel from a package of screws (any plastic package that has a flat panel will work) , I had the back off in no time. Had I continued to use the plastic pick shown in the instructions, I really doubt I would have gotten the back off since I couldn’t get enough force on the back from my suction cup. The thin package plastic acted almost like a knife as I moved it around the outside edge. WARNING: If you have to reheat the back, REMOVE THE PACKAGE PLASTIC!! It will start to melt from the heat of a heat gun. Good Luck!!