Here are a list of the most current OS releases for BlackBerry handhelds. Included is John Clark's post of OS installation myths ... give it a read if you have any doubts about installing an OS.

8100 - 8100EastAsia_PBr4.5.0_rel255_PL2.7.0.103_A4.5.0.162_Vodafone_Essar_Limited__for_Hutch_Essar_devices_ .exe
8110 - 8110EastAsia_PBr4.5.0_rel255_PL2.7.0.103_A4.5.0.162_Vodafone_Essar_Limited.exe
8120 - 8120EastAsia_PBr4.5.0_rel255_PL2.7.0.103_A4.5.0.162_Vodafone_Essar_Limited.exe
8130 (ESN) - 8130uAMEA_PBr4.5.0_rel281_PL3.4.0.51_A4.5.0.169_Alltel.exe
8130 (MEID) - 8130mAMEA_PBr4.5.0_rel281_PL3.4.0.51_A4.5.0.169_U.S._Cellular_.exe
8220 - 8220EastAsia_PBr4.6.0_rel471_PL4.1.0.98_A4.6.0.278_Indosat.exe
8230- 8230mAMEA_PBr4.6.1_rel422_PL3.3.0.92_A4.6.1.284_Alltel.exe
8300 - 8300EastAsia_PBr4.5.0_rel255_PL2.7.0.103_A4.5.0.162_Vodafone_Essar_Limited.exe
8310 - 8310M_PBr4.5.0_rel257_PL2.7.0.92_A4.5.0.163_Vodafone_UK.exe
8320 - 8320EastAsia_PBr4.5.0_rel255_PL2.7.0.103_A4.5.0.162_Vodafone_Essar_Limited.exe
8330 (ESN) - 8330uAMEA_PBr4.5.0_rel281_PL3.4.0.51_A4.5.0.169_Cellular_South.exe
8330 (MEID) - 8330mAMEA_PBr4.5.0_rel281_PL3.4.0.51_A4.5.0.169_Cellular_South.exe
8350i - 8350iAMEA_PBr4.6.1_rel316_PL3.0.0.73_A4.6.1.204.exe
8520 - 8520wifiM_PBr4.6.1_rel439_PL4.2.0.128_A4.6.1.296_BASE.exe
8800 - 8800EastAsia_PBr4.5.0_rel254_PL2.7.0.105_A4.5.0.161_Hutchison.exe
8820 - 8820EastAsia_PBr4.5.0_rel255_PL2.7.0.103_A4.5.0.162_Vodafone_Essar_Limited__for_Hutch_Essar_devices_ .exe
8830 (ESN) - 8830uAMEA_PBr4.5.0_rel281_PL3.4.0.51_A4.5.0.169_U.S._Cellular_.exe
8830 (MEID) - 8830mAMEA_PBr4.5.0_rel205_PL3.4.0.30_A4.5.0.138.exe
8900 - 8900M_PBr4.6.1_rel378_PL4.2.0.113_A4.6.1.250_TIM_Italy.exe
9000 - 9000M_PBr4.6.0_rel513_PL4.0.0.245_A4.6.0.301_AVEA.exe
9500 - 9500_omadrmjAllLang_PBr4.7.0_rel230_PL4.0.0.205_A4.7.0.167_TaiwanMobile.exe
9530 - 9530AMEA_PBr5_1_.0.0_rel508_PL4.2.0.128_A5.0.0.328.exe
9630 - 9630AMEA_PBr5.0.0_rel674_PL4.2.0.179_A5.0.0.419_MTS_Mobility.exe
9700 - 9700EastAsia_PBr5.0.0_rel680_PL5.1.0.116_A5.0.0.423_Bell_Mobility_Inc.exe

How to determine if you have an ESN or MEID based device.
From the main menu, select Options, then select Status.
ESN devices - On the Status screen you will see ESN on the display
MEID devices – On the Status screen you will see MEID on the display.
NOTE – You cannot install ESN-based software on a MEID device, nor can you install MEID-based software on an ESN device. They are NOT interchangeable.

If you find a released OS newer than one listed here, please post in the thread and one of the moderators will update this thread.

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