: To ensure a clean install, use a tool like BBSAK (BlackBerry Swiss Army Knife) to "Wipe Device" until you see Error 507 on the screen. Run the Loader : Connect your 9900 via USB. Open Loader.exe from the AppLoader folder mentioned above.
For modern users, caution is advised due to the lack of official support, but the availability of archived autoloaders ensures the BlackBerry Bold 9900 can still be revived and used offline – as a classic PDA, music player, or development testbed. blackberry 9900 firmware autoloader
Once connected, the tool will wipe the device and install the new firmware. Do not unplug the cable : To ensure a clean install, use a
You will see a blue progress bar on the phone screen (not the PC). First, the loader erases the memory (this takes 60 seconds). Then, it writes the OS. Then, it writes the Radio (Cellular/WiFi firmware). For modern users, caution is advised due to
Remove your microSD card and SIM card. (This prevents a weird "Media Card Inserted" freeze during boot).
. A black command prompt window will open displaying "Connecting to Bootrom". Connect the Phone: