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 v184.108.40.206 (Multilanguage)
Package Version: 220.127.116.11 This is just the package version.
Applications: 18.104.22.168 This is what counts, the Application version.
Software Platform: 22.214.171.124
File name: 8310M_PBr4.5.0_rel152_PL126.96.36.199_A188.8.131.52_AT&T.e xe
File size: 89.91MB