Unlocking of the bootloader is made available to make sure that MIUI developer ROMs can be tested by users and will be covered under warranty.
Bootloader unlocking does not inherently void your hardware warranty. But a case where the unlocking results in a brick which cannot be fixed via software, the warranty will be void.”
Xiaomi India spokesperson.
As the statement explicitly says, the warranty remains intact so long as a software fix can work on the bootloader unlocked phone. By extension, if you hard brick your device and it needs a hardware fix to be brought back to life, perhaps in the form of EDL pin-shorting or worse, a motherboard replacement, you will be out of luck and warranty. If any software fixes are needed, Xiaomi India will charge you a nominal amount (currently ₹150 plus taxes) under the general maintenance clause in the official warranty, in order to revert your phone back to the stable ROM available for the phone in that region.
This policy is applicable to Xiaomi phones in India under both the Mi and Redmi sub-brand. Other regions could possibly have variations to this policy. And before you ask, POCO is excluded from the scope of this article and this policy entirely as it operates as an independent unit and has its own separate policy.
After deleting the tweet, Xiaomi also updated their statement with a fresh response:
courtsey :- https://www.xda-developers.com
The Techipedia 