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Sony Xperia XZ2 - lock bootloader

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steev73
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Sony Xperia XZ2 - lock bootloader

How can I lock bootloader in Sony Xperia XZ2?
I wanted to update to Android 12 as internet banking app does not support Android 10 anymore - the last version officially provided by Sony.
There is a good unlocking-walkthrough at developer.sony.com which I have followed, but not a word about locking the bootloader back.

Now stuck with unlocked bootloader - I can't pay using NFC and some apps do not allow login.

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