Welcome to BB Forums.
You can search under the Device Specific Forums and go to Blackberry 8900 discussions. There's a link there (stickied on top) on how you can update your OS.
Have fun.
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9700 Unlocked BES
App:5.0.0.979 Plt:5.1.0.177
8900 Unlocked BIS
App:5.0.0.822 Plt:5.2.0.76
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