Xiaomi is now locking the bootloaders on Redmi Note 3, Mi 4c, and Mi Note Pro
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Sunday, 13 August 2017

Recently though Xiaomi has begun locking the bootloaders of the Mi 4c and the Mi Note Pro. The official version for all of these locks is "to protect user data safety". Of course this will improve the security, but there is a price.
First - locking a bootloader with an update isn't a risk-free process. Long story short - there are quite a few users with bricked devices, but since the locked bootloader disables fastboot, there is no solution for the owners. The bricks occurred after updating over the air.
Second - if you survive the locking process, you will be losing the root capabilities and the option to install other ROMs.
Third - you may apply for a bootloader unlock code, and may even get one. Here you can follow the guide for the process. But it turns out in order to apply, you have to be a forum member with a certain status/rank, then provide a reason for unlocking on a page that is completely in Chinese, and then it may take two or more weeks for you to get the SMS unlock code.
Xiaomi is a company well known for its policy of unlocked bootloaders and its fans love it for that. And even though it promises to unlock the bootloader of anyone who wants, there are plenty of obstacles on the way, some of them may even brick your Xiaomi smartphone.