I just found the frame can be separated from the glass with a spudger-type thing, I used a fine blade like a craft knife (be careful!!). started at the bottom inside end and worked my way around, trying not to damage the frame in the process. Just to clarify this is for the NX785QC8G.

The glass is attached to the frame with adhesive, so the new glass will need to be stuck back on in a similar way. It’s strange that this part wasn’t mentioned in the instructions, as it was supposed to be for replacing the actual glass digitiser screen, but didn’t quite get there… hope this is of some help.. although it’s 2021 now and you’ve probably gone and bought a new one lol ;) I love my tablet (well, my 4yr-old does) but I stood on it and I happened to have a digitiser on hand.