[TUTORIAL] How to lock(relock) bootloader P8 Lite ALE-L21

Hello folks,
After many unsuccessful attempts to lock the bootloader again finally found a solution. First and foremost it is necessary to say that success has been achieved on the device ALE-L21 Dual SIM Europe edition and original firmware C432B170 (Europe) installed as OTA update!!! Now I will describe the steps.
1. If you rooted device- make full unroot!
2. If you have TWRP remove it and reverse to original recovery!!!
3. Downgrade to C432B052 (Dual SIM / Europe)
4. Install last original firmware via OTA update!!! (In my case is C432B170 (Europe)
5. Connect device on PC
a) Open command prompt and type:

Code:

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adb devices

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b)

Code:

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fastboot reboot bootloader

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c)

Code:

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fastboot oem relock ################ (you unlock code)

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That is all. I hope this tutorial you has been helpful

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