The BlackBerry Pearl 9100 and 9105 have not had much OS love. The last OS 6 build to hit was OS 22.214.171.1244, which was not a very good build. Now, OS 126.96.36.1998 has dropped, and so far .418 builds seem to be pretty solid.
Download Pearl 9100/9105 OS 188.8.131.528 from:
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*DISCLAIMER* – This is an unofficial RIM software release. If you choose to install, do so at your own risk! BB Leaks is not responsible for any malfunctions or abnormalities that may occur.