Last night T-Mobile released OS 4.6.1.231 for the BlackBerry Curve 8900. OS 4.6.1.250 is actually the latest official OS for the 8900, but I figured I’d post this for those that only like using their own carrier’s OS.

• Device Fixes
  • Improved battery life
  • Improved software performance and stability
  • Improved UMA and data performance
  • Enhancements to audio and speakerphone
• Resolved Known Issues
  • Message icon and myFaves interface disappear after Enterprise Activation
  • myFaves contacts display an hourglass after a software upgrade
  • Missing myFaves user interface missing after a SIM swap
  • myFaves user interface missing after a SIM swap
  • Error: ‘Uncaught Exception’

You can find and download this OS at tmobile.com/bbupgrade. You need to have a T-Mobile number in order to access the downloads. If you need help upgrading your OS click here.

via T-Mobile Forums

English is included just in case…

Software For BlackBerry® Curve (TM) 8900 smartphone
BlackBerry Handheld Software v4.6.1.353 (EastAsia)

Package Version: 4.6.1.353
Consisting of:

• Applications: 4.6.1.231
• Software Platform: 4.2.0.108
• File name: 8900jEastAsia_PBr4.6.1_rel353_PL4.2.0.108_A4.6.1.231_Hutchison.exe
• File size: 121.59MB

Note: The Software Platform and Applications version numbers can be found under Options-About screen on the handheld.

• Download: OS 4.6.1.231 for the BlackBerry Curve 8900 from Hutchison

REMEMBER: Install at your own risk. Always make backups before making major changes/upgrades/downgrades to your BlackBerry.

Source: CB Forums

I get especially excited for Curve 8900 OS leaks because that’s the BlackBerry I have . If you decide to install 4.6.1.231 be sure to leave some feedback!

• Download via RapidShare: OS 4.6.1.231 for the BlackBerry Curve 8900

DISCLAIMER: Install at your own risk. This is Leaked/Beta software that is not guaranteed to be stable, and therefore will not be supported by RIM or your wireless carrier should you run into some problems. As a precaution, if you decide to upgrade, it is highly recommended that you make a backup before using this software. If you are not comfortable using Leaked/Beta software you should probably wait for the next official release. *

Big thanks to @wolwol!