In the Communication Port selection drop-down, you should see USB:UNKNOWN or USB:COMX . If it shows blank, wait for the computer to recognize the device drivers. Click .
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If the firmware bundle you downloaded does not perfectly match your original cellular network provider, the installation will fail unless you delete the vendor restriction file. Open File Explorer on your PC.
However, you can still update to OS 7.1 manually using a Windows computer and archived firmware files. Key OS 7.1 Features
The BlackBerry 7.1 update introduced several notable features to the Bold 9900:
According to BlackBerry's official End-of-Life announcement, legacy services for BlackBerry 7.1 OS and earlier ceased on . Devices running BlackBerry OS 7.1 can no longer reliably function for data, phone calls, SMS, or emergency services. BlackBerry Desktop Manager also has limited functionality. The service termination affects BlackBerry hosted email addresses, BBID accounts, and other core services.
Finding official software downloads for the BlackBerry Bold 9900 Go to product viewer dialog for this item.