Ok let me explain this to you. .152 IS .110. When you speak of .152 that is the PACKAGE verison of .110. And .110 is the APPLICATION version. So the reason you are getting the error that says theres no update available is because it is the same OS. Below I highlighted what it says on the download page:
Originally Posted by eishundo
BlackBerry Handheld Software v188.8.131.52 (Multilanguage)
Package Version: 184.108.40.206 This is just the package version.
Applications: 220.127.116.11 This is what counts, the Application version.
Software Platform: 18.104.22.168
File name: 8310M_PBr4.5.0_rel152_PL22.214.171.124_A126.96.36.199_AT&T.e xe
File size: 89.91MB