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How do we write back the original serial number?

Good Day. My question is that if a particular iPhone or iPad model needs a logic board replacement, how do we write back the serial number of the original to the new logic board? As far as I know when the logic board of a MB or MBP has to be replaced the serial number of the unit has to be written to the replacement logic board via the blank board serializer.

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Thanks guys for your replies.

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Most Authorized Service Providers have the software to do this. Getting a logic board that has not been serialized would be very unusual. It usually involves sending the old board back to Apple.

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Rey will be eternally grateful.
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