Follow this procedure carefully. The entire process, from downloading the file to the final reboot, typically takes about 10 to 15 minutes.

Power off your BlackBerry Classic completely. Connect it to the PC via USB. If it doesn't detect the phone immediately, try pressing and holding the power button or entering "Engineering Mode" [7†L38-L39].

When the window displays "Connecting to Bootrom," plug your BlackBerry into the computer. The device's LED should turn solid green

Ensure that BlackBerry Link or any other BlackBerry software is completely closed, as they can interfere with the connection.