[Galaxy S II Android Development] gh.rohit:
Changelog ICS B6 2.4.21:-

1. Added 3-Way Reboot.

2. Added CRT-Off animation.

3. Changed status bar icons to ribbin icons.

4. Updated GPS file for faster lock

5. Updated hosts file ( for no-ads in apps )

6. Added HD Youtube,Google Map, Apex launcher.

7. Fixed Music app by replacing old music app.

8. Tweaks for Faster stream Video and Music.

9. Tweaks for Net Speed

10. Adjusted Brightness for better battery life

11. Better 3G speed

12. Increased overall touch responsiveness

13. Improved scrolling responsiveness

14. Raised JPG quality to 100%

15. Tweaks for better battery life.

changlog based on miuiscotland+miuichina :-

[System]

Optimised the status bar height.

Removed Google Apps to reduce the overall package size and enforce MIUI Market in China.

Optimized back button kill options menu to select from between 0.5 seconds – 1.5 seconds.

Repaired issues surrounding the Instagram application not being compatible with MIUI.

Repaired issues surrounding USB dialogue box causing phone screen to freeze.

Repaired issues surrounding the UCAM application not being compatible within MIUI.

[Phone]

Phone icon will now display number of missed calls.

Optimised phone application, including open, search and slide to delete option.

Improved the call time display.

Repaired issue with some sims not being able to switch APN settings.

Repaired the call end button were green lines where still being shown.

Repaired issues with the international numbers not being displayed correctly.

[Contact]

Improved the issues with repeated numbers issue (The prefix issue).

Repaired the issue were entering a “,” within the contact details list would lead to a Force Close.

Repaired issues with contact name selections and repeated questions being asked.

Repaired group picture issues were it would show repeated pictures.

[SMS]

Added support to jump between single and bulk sms support.

Added ability to save MMS attachments to SD Card.

Introduced a new V4 SMS Interface. (Although we can’t see a difference?)

Corrected the issue where new SMS pop up refuses to close.

Optimised the SMS overlay for group messages by 50 to 75%.

Improved the fluency of the message list slide.

Optimised the time delay on text messages to within a ten year period.

Send a contact card is fixed, such as contact card information being repeated when merging contacts.

Repaired bulk SMS failed showing progress status.

Repaired issues when lock screen did not show MMS preview.

Repaired issues which lead to force close when too many recipients was added to a saved draft message.

Repaired issues were session page in some cases and collection page did not display the time.

Repaired issues were MMS time modifications could not occur.

Removing the SIM card does not display the “Save to SIM card” menu item repaired.

[Themes]

Optimised the system to load theme resources more efficiently.

Repair application theme, lock screen style is not in force

Repaired the customise current theme options menu to better support mix and match themes.

Repaired the issue which caused desktop wallpaper to not backup.

Repaired the details page when selecting an application within the “other” display screen.

Repaired the details page when clicking the menu button caused a black screen issue.

[Camera]

Repaired issues surrounding third party camera applications being unable to record video in non scene mode.

[Gallery]

Optimised details page and animation effects.

Optimised the the overlay when creating cache collection and generating photo information.

Fixed issues were connecting USB may lead to accidental deletion of files and records.

Fixed selection of pictures by third-party applications were selecting the last row would be blocked.

Repaired image details page were viewing a thumbnail would be fuzzy.

Repaired an issue which would result in camera to gallery selection causing images not being display.

Repaired issue were back button kill button would result in vibration motor issues.

Repaired issue were shown hidden albums would cause errors to occur.

Repaired issue which resulted in albums or images to not delete.

[Music]

Optimised background music playing support for single support mode.

[Backup]

Optimised backup and recovery processing for applications, by making it more secure and efficient.

Repaired issues were restoring a backup would result in possible duplication of SMS messages.

[WIFI & DATA]

Optimised the overview for the Wi-Fi interface.

Repaired issues were mobile sim card would only show 3G operators within the network selection menu.

[File Manager]

Optimised the file manager to resolve issues surrounding interface.

[FM radio]

Fixed an issue which resulted in a white bar to appear when entering FM application.

[Alarm clock]

Optimised the alarm clock settings

Fixed an issue which resulted in third-party applications causing the icon in the status bar not to display.

EDIT :- ADDED BRAVIA ENGINE