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The internal clock is crap. something like 10% error if i remember correctly, so high speed Uarts and time sensitive stuff all won't work well. There's a reason most uC designers still have an external crystal.
my method for this (without the cataclysmic scorching) is lots of extra solder and a hot soldering iron.add solder until there are ugly solder bridges completely joining all the pins then keep heating all sides, alternating from one side to the next.as soon as you manage to get all 4 sides molten at the same time, turn the board upside down and tap it. the chip should drop right off.then tidy up with solder wick.
what destroys boards is direct heat from flames... not the heat won't damage it...