Yes, putting a new logic board will let you use an icloud locked phone. You just can’t use the old logic board on a new phone since it will say it’s icloud locked.
For everyone asking. Putting a new logic board into an iphone means you will no longer have an activation lock. icloud recognizes a phone based on the logic board, so replacing it does the trick. Unfortunately the old logic board will always be locked even if you put it into a new iphone. So yeah, the cheapest way to be able to use an icloud locked iphone is replacing the logic board (assuming the new logic board did not come from another icloud locked iphone).
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