After a success story with upgrading my Javelin at here, RIM has released another version of OS 5 for 8900. The latest version is 188.8.131.521. You can find it here. All are released for operator in Europe. I upgraded the Javelin to 184.108.40.2061 with OS from Optus Mobile (Asia). Nevertheless I did the upgrade anyway. Afterward, I do not notice any differences in term of performance, memory, and stability. All software that I use on regular basis work just fine. I am still observing the battery, similar to 411 would be good enough for me. However, I notice that the keyboard/keypad lock icon is missing. The keyboard/keypad lock on top of the device also does not work.