MIUI 7 China Developer ROM 6.4.21 Full Changelog


  • Optimization – Increased buffering speed for some games (04-19)


  • Optimization – Improved layout for message bubbles with S and XS-sized text (04-20)

Mi Account

  • Optimization – Simplified sign-in process and creating Mi Account (04-19)


  • New – Added Tencent engine to improve productivity of Cleaner’s scans (04-20)


  • Optimization – Improved algorithms for trash scans to clear up more space (04-19)

Mi Cloud

  • Optimization – ‘Back up apps’ is updated to ‘Back up device’.
  • Support for backing up system settings. Allows restoring easily. (04-19)

MIUI 7 China Developer ROM 6.4.21 is available on the following devices: Mi 2, Mi 2S, Mi 3, Mi 4, Mi 4c, Mi 4S, Mi 5, Mi Note, Mi Note Pro, Redmi 1, Redmi 1S, Redmi 2 / Prime, Redmi 2A, Redmi 3, Redmi Note 3G, Redmi Note 4G, Redmi Note 3 MTK, Redmi Note 2, Redmi Note 3 Qualcomm, Mi Pad & Mi Pad 2.


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