MIUI 7 China Developer ROM 6.4.21 Full Changelog
System
Optimization - Increased buffering speed for some games
Messaging
Optimization - Improved layout for message bubbles with S and XS-sized text
Mi Account
Optimization - Simplified sign-in process and creating Mi Account
Cleaner
New - Added Tencent engine to improve productivity of Cleaner's scans
Security
Optimization - Improved algorithms for trash scans to clear up more space
Mi Cloud
Optimization - 'Back up apps' is updated to 'Back up device'. Support for backing up system settings. Allows restoring easily.
(assim que tiver tempo traduzo) sorry......
Agradecimentos:
Ayashie, Eduardo Reis and 2970713