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How to relock bootloader official

Hi Asus
I am usin Asus Zenfone Max Pro M1 phone I want to know how to officially relock bootloader on my phone.
Zenfone Max Pro M1

Community Legend II
Hi pankajpaikra1503
Thank you for your asking. First, please note that unlocking the device or flashing the custom ROM are quite risky, may causing security issues like Widevine Issue, banking app usage issue, or unexpected software issues. Second, any unlocked/rooted/custom rom device will be regarded as out of warranty device, revised device. Last, officially, we do not provide lock back service/tools. Once the device is unlocked, the server will have related record and it can never be revised even if you lock the device back by yourself.
For more information, please check the picture as the release notice of Unlock boot loader on our official website. Thank you.

Rising Star II
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