How to Update G1 Phone Firmware CUPCAKE 1.5

How to Update G1 Phone Firmware CUPCAKE 1.5

1. Download 1.5 update from Google here.

2. Rename it the download file to
to update.zip(do not unzip, do not open file with WinRar, if in windows just change the name to "update", no need for "update.zip" since it is a zip file already) and place it at the root i.e the very top directory of your Micro SD card. (If you added the file to your microSD card by connecting the handset to your computer via USB [rather than using a dedicated microSD card reader], make sure to unmount it and disconnect the USB cable now.

3. Turn off your G1 Make sure it completely powered off. Now again turn it on by holding the Home+End keys until you see T-Mobile G1 logo.

4. From the icon screen, open the keyboard and hit Alt+L.

5. Press Alt+S to begin the update. Remember, the update needs to be in the root of the Micro SD card and needs to be named update.zip.

6. Once it finishes, follow the onscreen instructions and press Home+Back to finish.

7. G1 Phone will reboot a few times to flash different parts of the firmware(might take a few minutes, don't worry).

If all went well, you should now be running the latest update, 1.5. Enjoy your new, shiny Cupcake update!

To make sure all your hard work wasn’t for nothing, hit Menu > Settings > About Phone > scroll to Build Number. You should see 1.5 Build in there somewhere.