For you G1 Google Android Owner from T-mobile you can update the RC29 manually. You can find here to update your G1. all you have to do is prepare PC, internet connection, data storage to save the firmware, better in your Micro SD card to save the firmware.to know step by step how to update the firmware you can find below:
1. download the new firmware zip file here.
2. Rename it from signed-kila-ota-115247-prereq.TC4-RC19+RC28.zip to update.zip, and place it in the root of your Micro SD card.
3. Turn off your G1, then turn it back on by holding the Home+End keys until you see an icon popup after the T-Mobile G1 logo.
4. From the icon screen, open the keyboard and hit Alt+L. This will display the log saying what is happening (although you can skip this step).
5. Now 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, just follow the onscreen instructions and press Home+Back to finish.
7. The G1 will reboot a few times to flash different parts of the firmware.Done you get the new firmware.
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