Instructions to enter download mode in galaxy 5
1.Turn off phone
2.Remove battery , sim and Sdcard from the phone.
3.Now without putting the sim and sdcard put the battery and donot turn the phone on.
4. press and hold Volume down + Center Button(Not the home button) + Power on Button
note : while pressing the 3 button combination press and hold the button in sequence vol down + center button then power off button.
5. Now phone enters download mode displaying a yellow android inside a triangle with caption download.
To exit download mode take off battery and turn on as normal.