It seems some files from the soon-to-be-official Verizon OS 126.96.36.1991 for the Bold 9650 have leaked out. These files where zipped up into an installer for easier upgrade. You must have OS .333 or .415 installed to upgrade to .431. Think of this as a glorified hybrid.
Download Bold 9650 OS 188.8.131.521 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.