AT&T had previously taken down BlackBerry OS 4.6.0.297 for the Bold 9000 because of technical issues but it looks like it was re-released with an updated Software Platform version. The Software Platform version from the previous AT&T Bold OS was 4.0.0.243, in this re-released OS the version is 4.0.0.247. This is not the newest available OS.

Software For BlackBerry® Bold (TM) 9000 smartphone
BlackBerry Handheld Software v4.6.0.517 (Multilanguage)

Package Version: 4.6.0.517
Consisting of:
Applications: 4.6.0.297
Software Platform: 4.0.0.247
File name: 9000M_PBr4.6.0_rel517_PL4.0.0.247_A4.6.0.297_AT_amp_T.exe
File size: 96.79MB

BlackBerry Handheld Software v4.6.0.517 (EastAsia)
Package Version: 4.6.0.517 Consisting of:

Applications: 4.6.0.297
Software Platform: 4.0.0.247
File name: 9000jEastAsia_PBr4.6.0_rel517_PL4.0.0.247_A4.6.0.297_AT_amp_T.exe
File size: 97.68MB

WARNING:
Do not install this software if you do not know what you are doing.
It may make your BlackBerry FUBAR or just plain angry. This also may
cause your guarantee is void!!

DWIYOR (DO WITH YOUR OWN RISK)

Link: download