Introduction
This is a guide to replace the motherboard of your Apple Magic Keyboard 2 A2450. This guide uses the iFixit Pro Tech Toolkit
Tools
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            Apply heat around the perimeter of the lower case to loosen the adhesive that secures the lower case to the chassis. 
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            Insert an opening pick in the gap between the lower case and chassis. 
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            After ensuring that the adhesive is warm, slide the pick around the perimeter to sever the adhesive. 
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            As you sever the adhesive, insert additional opening picks at each corner to prevent the adhesive from readhering. 
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            Remove the lower case. 
 
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            Use a T3 Torx screwdriver head to remove all twelve 5 mm that secure the midframe. 
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            Use tweezers to disconnect the battery motherboard connection. 
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            Remove the midframe. 
 
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            Use a T3 Torx screwdriver to remove the two 5 mm screws that secure the lightning port. 
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            Use tweezers to remove the Lighting port from the motherboard. 
 
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            Use a T3 Torx screwdriver to remove the three 3 mm screws that secure the motherboard. 
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            Remove the tape covering the ribbon cable on the top half of the motherboard. 
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            Use a small pair of tweezers to gently unplug the ribbon cable and remove the motherboard from the keyboard. 
 
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To reassemble your device, follow these instructions in reverse order.