1) Turn Off the Phone
2) Remove Battery
3) Remove Sim Card
4) Put battery and sim card again
5) Turn On the phone
6) Press Menu
7) Factory Data Reset (Remember that: This action will reset the phone to its initial factory state, erasing all data and wonloaded applications, so BACKUP BACKUP BACKUP first you try this).
Press "reset phone"
HARD RESET
1) Turn off the Phone
2) Press HOME + POWER KEYS (keep them holding for about 25 secs)
until you see a screen with a phone and a triangle.
then
3) SLIDE YOUR KEYBOARD TO OPEN IT
4) press ALT + l ( TO SHOW YOU OPTIONS)
5) Press ALT + W ( TO FORMAT ALL DATA)
Note: When I write the sign + you don't have to press the + sign, it means that you need to press both keys @ the same time.
Note2: Don't do this if you don't have a Data Plan or your 2G or 3G is not working, why? because you will not be able to sign in again without a working Data Plan (2g / 3g).
1. Download RC33 update from Google here.
2. Rename the download file from signed-PLAT-RC33-from-RC30.f06aa9b3.zip to update.zip,
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's
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.
If all went well, you should now be running the latest update, RC33. Enjoy your new, shiny RC33 update, complete with Google Latitude!
To make sure all your hard work wasn't for nothing, hit Menu > Settings > About Phone > scroll to Build Number. You should see RC33 in there somewhere.
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