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Basically try not to do it. If you want to have another go with the blunt ones you can file some teeth into the blade. There are lots of blades that promise they can do it but it's a big ask. You have to keep the heat out of the blade to reduce the damage so go slower or take a lot longer and you can sometimes get there.
Airhead
Any recommendations for a multi tool blade to cut through screws?
The pics will show the issues I had today. The narrower blade is a DeWalt bi-metal blade. The wider one a cheaper one.