This was copied from a site on the web. I personally have used the instructions below and it worked for restoring my G1. Once it is restored, you may want to try to run the update again.
1. Turn the G1 off. If it’s frozen on, take the battery out and put
it back in the unit.
2. Hold the Home and Power keys
down at same time for about 25 seconds. You will see a yellow triangle
screen with exclamation point in the middle.
Now to wipe the device clean:
3. Press Alt+L.
4. Press Alt+W for a factory reset.
5. Press the Home and Back keys
again for about 25 seconds.
The phone should reset again and the hard reset is complete.
I have the same problem but it goes back.. wont let me update my g1 i have the first virsion and did everyything to change it but i cant
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