It's probably covered in some of the other threads.
When i need to do a tire repair i usually remove the valve from the valve stem and let the air out. Once it's flat i run over the rubber part of the tire with my truck to break the bead seal. From there, you just use a couple of crow bars to mimic the action you get with a tire changing machine. ( It can be a booger to do with trailer tires sometimes cause they're small & tight.)
It's probably not glue that's holding the bead. There are wire " steel belts " inside the rubber tire where the tire meets the rim. These cords stretch when you're inflating the tire to give you a really tight grip to the rim.
If you're cutting the tire off with an angle grinder or a sawzall you have to cut those cords to get the bead to release ... if that makes any sense ?
Kind of a smokey, stinky, messy job but sometimes that's the only way to get a shredded up tire off the rim.
ETA: You can burn it off by tossing the whole works into a brush pile and setting it ablaze.
The Environmental Protection Agency frowns on that kind thing but it does do a bang up job.
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