As OS 5.0 leaks float around the net available for many of BlackBerry devices including the BlackBerry Bold 9000, it might not suit you yet as it is still a leak, or you just want to stay on the safe side and do official OS updates.  Here’s the general specifics for this OS:

BlackBerry Handheld Software v4.6.0.518 (Multilanguage)
Package Version: 4.6.0.518
Consisting of:

• Applications: 4.6.0.303
• Software Platform: 4.0.0.248
• File name: 9000M_PBr4.6.0_rel518_PL4.0.0.248_A4.6.0.303_MobiTel_Bulgaria.exe
• File size: 96.81MB

To download the official OS, click here.

-by Mac Jadalhack

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