1-A heat gun on the back of the board will heat the solder enough to pry them off. Just don't burn the board it will give off toxic gases.
2- get a baking tray and put some sand on it. Put on a heat source, hot plate or bbq grill. Place the board face up on the sand so the solder warms up enough so you can pry off the chips.
IF YOU ARE GONG TO DO THIS IT SHOULD BE DONE OUT DOORS NOT INSIDE YOUR HOUSE !!!!
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