When you'll try to Unlock Bootloader of Xiaomi Mi 5X or Redmi Note 5A you'll get a message "Unlocking mechanism for this device is being updated. Learn more about this on MIUI forum".
"In order to enhance our mobile security, the unlocking mechanism for the following devices is being updated currently. The affected devices are Mi 5X and Redmi Note 5A/Prime. During this period, Mi 5X and Redmi Note 5A/Prime owners won't be able to unlock the device. Sorry for any inconvenience caused."
"Developers are still working on bootloader system and issues found in Mi 5X. That is why China Developer ROM for Mi 5X was suspended since 15th September. They do not provide any specific timeline for the fix yet." - MIUI Forum
It's been one month since Mi 5X and Redmi Note 5A users are waiting for Xiaomi to let them unlock their own devices and there's not even a single update from Xiaomi about this.
Let's cut the bullshit, Xiaomi. Let us Unlock our device's Bootloader!
[Update 20 Oct, 2017] Xiaomi has now updated it's mechanism, the Mi 5X, Redmi and Note 5A/Prime users will now be able to Unlock their Device's bootloader.
"The upgrade of the unlocking mechanism has been successfully completed. Thus, the unlocking service for Mi 5X and Redmi Note 5A/Prime has been restored. Thank you for your kind cooperation and understanding throughout this period."