Over the weekend, I activated a second smartphone on my Sprint account, a BlackBerry Curve 8330. (For those keeping score, I was using a Curve 8330 as my primary phone between December, 2008 - June 6, 2009; the day that the Palm Pre was released.) While configuring BlackBerry Device Manager 5.0 on my PC, I noticed that there was an OS upgrade for my new Sprint BlackBerry.
Sprint customers who use the BlackBerry Curve 8330 can upgrade from BlackBerry OS 188.8.131.52 to BlackBerry 184.108.40.206. As far as I can tell, the .175 build of BlackBerry OS 4.5 is largely a maintenance release as all of the BlackBerry applications in the package build are still listed as version 4.5.