Turn off your BlackBerry 9900. Remove the battery, wait 5 seconds, and reinsert it. Connect the phone to the PC via the USB cable immediately.
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An autoloader your phone. If your phone still boots up intermittently, back up your contacts, SMS messages, and device settings using BlackBerry Desktop Manager immediately. If your phone is already bricked, your data cannot be saved. Step 2: Prepare the PC and Phone Turn off your BlackBerry 9900
No need for Desktop Manager or Link. Just: This public link is valid for 7 days
Search for "BlackBerry 7.1 OS Autoloaders" to find mirrored files.
If the autoloader fails, your phone may be completely "Nuked" (shows only a blinking red light or a black screen with a battery error). Here is how to force a recovery: