This is the MIUI ROM for Mi 4 to be flashed via Fastboot mode. You may need this ROM package just in case your Mi 4 got bricked somehow so you have to revert back your phone to stock firmware. You may also need to use MIUI ROM Flashing tool which is Windows based tool to flash an Android firmware. As you might already know it, that recently Xiaomi has pushed out a new update bringing Android 6.0 (Marshmallow) for Mi 4 device but unfortunately not all users are aware how to update it properly. So, just in case you are one of those unlucky users, then I believe you will need it.
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Version 5.12.10 (global) | 10664 downloads | 856 MB