I love my G1 and I abuse it to no end. For instance, I’ve easily tried 250+ (if not 350+) apps on it. That much installing and uninstalling can lead to problems. And I finally decided I needed to hard reset my phone, because it would easily become sluggish and unresponsive during simple tasks.

Before I did the hard reset, I downloaded the UK version of Cupcake, because I have no patience and the US version has not been pushed out OTA (over the air) yet. I’ve used it for a few days, and I think it is finally pointing Android in the correct direction. But when the US version rolls out (the UK Cupcake is missing Amazon MP3, IMing aside from gChat, no voice search, and a few other things), I’ll need to downgrade and upgrade back to RC33 and then grab the US Cupcake OTA.

I hard reset my phone, and then it took me a frustrating amount of time to find the proper downgrade and upgrade files. To save other people some time and frustration here are the files – these are the official, OTA, and properly signed files. Also, if you’re not aware each update to Android has a radio update too. Radio updates are included in the update packages, so there is no need to go hunting for those.

Warnings:

  1. Do not trust your battery during an downgrade or upgrade. Plug in to a wall.
  2. Do not interupt your phone during these procedures – let the G1 finish its business. It will often reset, then continue the update, or will apply the radio update on reboot – so follow the on-screen prompts carefully and be patient.
  3. I will help to a degree with questions pertaining to this. Anything else should be directed to a G1 forum.
  4. I am not responsible if you fuck up your phone.

DO NOT DIRECT LINK TO THESE DOWNLOADS OR I WILL TAKE THEM OFFLINE IMMEDIATELY. BE KIND TO MY BANDWIDTH!

Note: These are the OTA, signed files. You cannot use these to root your phone.

G1 – RC29

  1. Download and unzip the RC29 file
  2. Format your SD card to FAT32 and place
  3. Place the DREAIMG.NBH file on the SD card (do not place it in a subfolder)
  4. Turn on the phone while while holding the home key
  5. When you see the triangle icon, hit ALT+L
  6. Now press ALT+W to wipe the phone
  7. Turn the phone off
  8. Power the phone in to bootloader (power it on while holding the camera key)
  9. The G1 will detect the RC29 image and it will proceed from there
  10. Follow any on-screen prompts

G1 – RC30

  1. Download and unzip the RC30 file – what you want is to have a file that is called “update.zip”
  2. DO NOT unzip “update.zip” – leave it the way it is
  3. Copy update.zip to the root of your SD card
  4. Turn on the while while holding the home key
  5. When you see the triangle icon, hit ALT+L
  6. Press ALT+S at the menu
  7. When prompted, press the home and back buttons
  8. It should reboot and now update the radio
  9. Finally it will reboot to the normal Android screen
  10. Viola, you’re done.

G1 – RC30 to RC33

  1. Download and unzip the RC30 to RC33 file – what you want is to have a file that is called “update.zip”
  2. DO NOT unzip “update.zip” – leave it the way it is
  3. Copy update.zip to the root of your SD card
  4. Turn on the while while holding the home key
  5. When you see the triangle icon, hit ALT+L
  6. Press ALT+S at the menu
  7. When prompted, press the home and back buttons
  8. It should reboot and now update the radio
  9. Finally it will reboot to the normal Android screen
  10. Viola, you’re done.

G1 – RC33 to UK Cupcake

  1. Download and unzip the UK Cupcake file – what you want is to have a file that is called “update.zip”
  2. DO NOT unzip “update.zip” – leave it the way it is
  3. Copy update.zip to the root of your SD card
  4. Turn on the while while holding the home key
  5. When you see the triangle icon, hit ALT+L
  6. Press ALT+S at the menu
  7. When prompted, press the home and back buttons
  8. It should reboot and now update the radio
  9. It may reboot a time or two, and then it should go to the classic “Android” boot screen.
  10. Viola, you’re done.

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