Update your G1 android firmware manually , Do it befor google updates and remove firmware.

1. Grab the RC29 update from Google here.”no longer available for download”
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 http://en.wikipedia.org/wiki/MicroSD card.
2.5. If you added the file to your microSD MicroSD card by [...]