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Bizarre problem after changing logic board

Hi

Ok do I had a mint condition iPhone 4 which had an activation lock . I changed the board for one in an old iPhone 4 I had which I knew the iCloud details

All went well the phone powered up , I disabled FMI and signed out if iCloud

I then erased all content and settings and to my horror was greeted with the activation lock screen bound still to the iCloud of the logic board I removed ?

How is this possible ? Is there another component aside from the logic board that stores the phones serial number etc ? I'm baffled and have never seen this before in countless others I have done

Any help greatly appreciated

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No this doesn’t sound possible, unless it was somehow cloned many years ago. The serial and IMEI number are programmed into the CPU of the motherboard. A housing and screen swap can have no influence on the serial number or IMEI number.

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I know , I agree with you completely but this is happening. It's 100% got the new board installed in it as I used it for a while with my old iCloud before signing out and resetting the phone . And now it asks for the same email address to activate that was already on it before the logic board was removed - which is sat on my kitchen side !

I still tried my original iCloud to activate even though I had turned it off but to no avail

I'm stumped I have no idea how this could be possible

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