It's best if you never have to, but if you do need to take apart your Xiaomi Redmi Note 4 at least now you have a guide. And as it turns out, it's not that much of a hassle. Most components (including the aluminum back cover) are not secured by screws so you just need to pry them off. Usually, it's either glue or double-sided tape that holds pieces to the motherboard and the team at FoneArena that disassembled the phone reports it worked just fine after they put it back together. Here's an interesting note - the Redmi Note 4 that is powered by a Snapdragon 625 used a Sony IMX 258...
Source: http://www.gsmarena.com/xiaomi_redmi_note_4_taken_apart_easily-news-23091.php
