& download Kindle 3G (Free 3G + Wi-Fi) - U.S. and Canadian Customers*: Download 3.0.3
Your serial number will start with "B006" (My Kindle bought for US Amazon & chose this version)
2.To connect you Kindle by USB cable , then open the Kindle storage disk and drag & drop you download file "Update_kindle_3.0.3_B006.bin" to the disk.
(you will see a lot folder ,just put on the directory & no into any folder)
3.Eject the Kindle to safely disconnect Kindle from your computer and Waiting your Kindle firmware installation and to be auto restart.
finished & check your Version info again
Home => Menu => Setting(show on the screen right down)
If you see "Version:Kindle 3.0.3"
Congratulation
It's easy by 3 steps to update your Kindle firmware.