Download the official OS v4.5.0.188 executable (.exe) from a reputable third-party archive, as official BlackBerry download servers are no longer active.
| Version | Type | Exclusive feature | Notes | |--------|------|----------------|-------| | 4.5.0.81 (leaked) | Beta | Improved UMA (Wi-Fi calling) stability | T-Mobile variant | | 4.5.0.124 (official) | Carrier | UMA 1.0.4, better battery | T-Mobile exclusive for months | | 4.5.0.182 | Generic | None | Final stable for 8320 | | Hybrid OS (4.5 + 4.6/5.0 files) | Custom | Improved memory management | Community-made “exclusive” mods | firmware change update on blackberry 8320 curve exclusive