[Contacts]
Optimization – Simplified display method of WeChat/Google+ accounts

etc. in contacts detail page
Optimization – Set QQ as default IM when adding a new contact
Optimization – When sending contacts information using SMS, the

contact's recently used number will be marked
Fix – Sometimes, opening unnamed contacts would cause app to FC
Fix – Some characters blurred in the add new contact page
Fix – Form error in contacts settings page
Fix – Call logs could be seen in Guest mode
Fix – When managing SIM contacts, the app might FC if you reenterit after exiting by pressing the Home button
Fix – When adding an extension number to contacts after calling it,the number would show incorrectly
Fix – If set a contact's birthday to February 29 without choosing

the year, it would show as March 1
[Lockscreen, Status bar, Notification shade]
Optimization – If a theme needs to unlock by swiping upward, the

upward arrow wouldn't show
Optimization – Added gradual black change when there's no

lockscreen password
Optimization – Transition animation of Notifications page and

Toggles page
[Home screen]
Optimization – Optimized icon size
Optimizaiton – Icon shadow is turned off by default
Fix – When searching apps in the dock, the app's icon didn't show

completely
Fix – Sometimes, icons couldn't be moved to the right of the dock
[Gallery]
Fix – After user upgraded versions, app would FC
[Weather]
Optimization – Optimized UI for extremely hazardous AQI
[Mail]
Optimization – New version of MIUI Mail
[Calendar]
Fix – The screen wouldn't turn off after being waken up by pop-upreminder
Fix – Sometimes, the homescreen widget showed months incorrectly
[System]
Fix – Open SSL security flaw

Firmware is fully operational .All the shortcomings of past drivers were thoroughly cleaned .This firmware is still not official, but not have a third-party software , anyone can put anything you want.It has Guglosoft in the smallest unit , the application APP4PDA, which will put any software.Firmware itself is what something like a hodgepodge of all developer versions Miui V5.And at the same time I tried to make the firmware – which will soon be in MIUI V6 and not in need of updating a long period of time.The firmware unique camera supports HDR, SnapShot, video stabilization . All settings are available in Advanced mode.Just thought it necessary to include firmware WSM + Mi-Tools. They will help to customize many seriously enough .

[Messaging]
Optimization – Show pop-up notifications when clicking URL in MMS
Fix – Sometimes app might FC when enabling cloud messaging in Mi Cloud
[Lockscreen, Status bar, Notification shade]
New – Number of an app's notifications shown on it's icon supports third-party customization
Optimization – Icons of toggles in the Notification shade
Optimization – Status bar style
Optimization – Do not support swip down gesture for floating notifications
[Home Screen]
New – App names and other home screen elements will automatically change colors with wallpapers
New – Support auto-filling blanks after batch deleting icons in home screen editing mode
Fix – Sometimes, icons were repeated
Fix – Sometimes, icons in the Dock were in wrong order
[Music]
New – Support syncing songs to Mi Cloud (Settings – Mi Cloud – Music)
Optimization – Use high definition pictures in the online music details page
Fix – Incorrect round corners in the online music details page
[Weather]
Fix – Bottom half of the main page was blank
[Mail]
Optimization – Mail Login page
Fix – It would go back to the homescreen after logging into account
Fix – Receiver names in the Cc box might show unrecognizable code
Fix – Receiver names might show unrecognizable code
Fix – Incorrect form in the composing email page
[Browser]
New – Show searching results in a new page after choosing Find in page for selected text
New – Data saving mode
New – Online page text font will change with theme font
New – Support WML page
Optimization – New kernel supports system theme font
Fix – Music would continue playing after being discontinued
[Calendar]
Optimization – Month view style
Fix – Incorrect page form when creating new events
Fix – App would FC when clicking on the location in an event
Fix – Sometimes, page moved slowly when swiping
[Other]
Fix – Sometimes com.xiaomi.eventreceiver would crash
[Xiaomi Account]
Optimization – Guide page style
[Security]
Fix – Incorrect system storage in Cleaner – Advanced

[ Lokskrin , Status Bar ]
[+] Incoming calls and messages will only be displayed in the status bar in full-screen action , for example when watching videos .

[Browser ]
[O] Support for use of abbreviations as you type in the website address (Nexus 7 II)

[Security]
[F] Sometimes cleaning is not working

[Music]
[O] Improved interface and fixes some bugs (Nexus 7 II)

[Mail]
[+ ] Support for thumbnail view
[+] Support for viewing unread messages and marking one touch
[O] Ability to upload an attachment not only Wi-Fi network
[O] Search through the server using Exchange account
[O] Improved algorithm for downloading attachments when memory
[O] Improved algorithm to save a draft
[O] Quick reply will be canceled , if you hold the slide to the right to Drafts , Outbox, and Sent
[O] Icons types of investments will be centered. Support for viewing bmp and gif images
[O] Removed two -byte space at the beginning and end of the name of the sender
[O] Improved interface download
[F] Notifications on the status bar is displayed again after removing the slide
[F] Attached images are not displayed
[F] After deleting the account , investments that account will also be deleted
[F] Messages Exchange account is not synchronized if the system settings has been disabled Auto Sync
[F] Sometimes when multiple upgrade fails with data transfer
[F] It was impossible to set up an account manually
[F] Contact information is not displayed correctly when you click on a contact photo

[Messaging]
Optimization – Support recognizing time information in a message and adding it to Calendar (5-21)

[Lockscreen, Status bar, Notification shade]
Optimization – The two arrows of the Data toggle always show when connecting data (Redmi 1S WCDMA/CDMA, Mi3 WCDMA/CDMA) (5-20)Fix – Sometimes, the No SIM Card icon would not disapper (5-21)

[Camera]
Fix- Sometimes camera lost focus when flashlight was turned on (Mi3 WCDMA/CDMA) (5-22)

[Music]
Optimization – Popup menu of online music list (5-20)
Fix – Some bluetooth earphones wouldn't show music information on it's screen (Mi3 WCDMA/CDMA) (5-20)

[Weather]
New – Added two weather types: Freezing rain and hail (5-20)

[Settings]
Fix – Incoming calls from people in the exceptions list of DND did not ring (5-20)

[System]Fix – Sometimes could not register Xiaomi Account using the current phone number (Mi1/1S) (5-22)
Fix – Could not use VPN (Mi3 WCDMA/CDMA) (5-22)

[Calendar]
Fix – Sometimes app would FC in opening (5-20)

[Blocklist]
Fix – DND exceptions list and Blocklist exceptions list caused conflict (5-20)

[Clock/Calculator]
Fix – Sometimes alarm clock delayed in ringing (5-21)

[Mi Cloud]
Fix – After choosing Do not merge in the popup window of merging Mi Cloud data, it did not direct to the next step (5-20)

[System]
Fix – GPS did not use other satelites than GPS when there's not network
[Messaging]
Fix – Homescreen popup window did not show incoming messages' content
[Themes]
Optimization – Boot animation after updating
Optimization – Ringtone selection page in Mi Pad
[Mail]
New – Added 'Resend all' function in Outbox
Optimization – Enhanced speed of batch operation
Optimization – Exchange account login procedure
Fix – Sometimes app would FC when deleting mails by swiping to the left
Fix – Sometimes there were two back icons at More – Sync options
Fix – Sometimes it would report error when sender box is empty
[Browser]
Optimization – Optimized Text magnifying glass when selecting texts in a webpage. The content near the selected area will also be shown in the magnifying glass
[Virus Scan]
Fix – ‘Pause’ button did not work when scanning