Optimization - Vibration for notifications during calls (06-16).
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New - New content provider for Wallpaper Carousel - Glance.
Fix - Messaging force closed in some cases (09-27).
Fix - Messages with one-time passwords disappeared (09-07).
Fix - Time in Messaging didn't change when the system was switched to 12-hour format (08-29).
Fix - OTP messages were grouped with notification SMS (06-16).
Fix - The app didn't respond when multiple contacts were deleted (05-12).
New - App lock supports hiding messages from selected apps (10-31).
Optimization - Vibration no longer affects the features which reduce ringer volume when the phone is lifted or flipped to silence (10-10) (R2P).
Fix - Long pressing soft buttons lead to FC issues (09-19).
Fix - Apps stopped working in the background (06-24).
Fix - Apps changed Wi-Fi connection status without the user's permission (06-23).
Fix - Home screen loaded too slow with Android 7.1 (06-23).
Optimization - Devices with rare Bluetooth profiles are hidden in the device list (07-25).
Optimization - Increased system decryption speed (06-23).
Optimization - "Add to favorites" icon adjustments (10-24).
Optimization - Simplified and improved the design of the virus scan result page (09-07).
Optimization - Devices with rare Bluetooth profiles are hidden in the device list (08-29).
Optimization - Redesigned home page (08-24).
Optimization - Protection from unintentional tapping for Dial pad (08-08).
Optimization - Cleaner removes empty folders better now (07-10).
New - New App vault features: shortcuts, brief notes, calendar events, and cricket.
New - New App vault features: shortcuts, brief notes, and calendar events.
During migrating data to the new phone, device hotspot connection will be restored automatically in case of interruption to complete the data migration.
New - Mi Mover, supports data migration restarting.
New - Quick ball goes back to the edge after 3 seconds of inactivity (08-30).
New - Mi Picks gets a new name and a new icon! Meet Apps! (08-21).
New - Search for apps in the Dual apps settings (08-03).
New - New display formats for update logs in Updater (07-25).
New - Switch for turning Battery saver automatically when charged (07-19).
New - Better blocklist rules with the possibility of separated rules for every SIM card (07-10).
New - Virus scans and payment scans were merged into Security scan (06-29).
New - Improved layout and readability for search results in Contacts (06-29).
Here's the full changelog and download links for Redmi 2/Prime - MIUI 9 Global Stable ROM.