I recently worked out a flawless method to downgrade iPhone 2G to iOS 1.0, as well as how to jailbreak, activate and unlock it. It's fairly straightforward as long as you follow these directions exactly.
A virtual machine or computer running Windows XP**
An iPhone 2G (derp!)
I personally used VMware Workstation 8 to create a virtual machine using my old copy of Windows XP Professional (fresh install) in order to do most of this. You could also likely use Windows XP Mode (if you have Windows 7 Pro/Ultimate/Enterprise). An obvious option is a computer running Windows XP, however if it's already had a newer version of iTunes installed on it you may run into issues.
First things first -- credit where credit is due:
George Zhu - for iLiberty+ and his great blog
iphone-elite - for information on how to patch lockdownd to be activated
SonnyDickson (Modmyi forums) - for posting the iTunes version & OS needed
... and of course everyone else that contributed to the scene that made this possible.
It should be stated that I have gone through this entire process with a fine-toothed comb in terms of every detail. I have run through this many, many times on my phone in order to make sure this process works without a hitch.
And don't be scared -- if anything goes wrong at all, you can always start fresh with a DFU mode restore to iOS 3.1.3 and start everything over again. Trust me, I have done it about 30-40 times now. :)
Also, it should be noted that after jailbreaking iOS 1.0, iTunes doesn't seem to recognize the phone anymore. It appears for a split second, then disappears. I'm not sure how to resolve this issue, it might simply be an effect of the iOS 1.0 jailbreak itself.
I repair iPhones as a side business, and over the years I started to collect iPhones. One day I decided I would buy an iPhone 2G (the original iPhone) to have in my collection. I managed to get one off eBay that was in decent condition and in the original box.
When it arrived, I wasn't surprised that it had iOS 3.1.3 installed on it, since the owner had likely restored the phone before selling it. At that point I made it my goal to see if I could somehow get the original iOS 1.0 (technically iPhoneOS 1.0) installed on it.
Initial attempts to downgrade the iPhone 2G to iOS 1.0 using the latest iTunes failed miserably. I started trying older versions, one by one, without success. I even had Mac OSX running in a virtual machine and tried multiple versions there, again without success. I kept plugging away at it, figuring it must be possible. As Henry Ford said, "Whether you think you can, or you think you can't -- you're right."
After much time spent searching, reading, trial and error, followed by more searching, I finally found the key that makes this work. Proper credit must be given to SonnyDickson of Modmyi forums, who posted the proper iTunes and OS versions required to downgrade properly.
It turns out that you must use iTunes 188.8.131.52 running under Windows XP in order to ensure a smooth downgrade to iOS 1.0. If you do not use this exact combo, you will almost certainly run into iTunes error 20, error 1600, error 1601, 1602, etc. While it is possible that other iTunes versions or OS's may work, I'm simply sharing what has worked for me. If you know of another iTunes version or OS that will work, let me know and I will post an update.
So after a lot of fighting with my iPhone 2G, I finally managed to get iOS 1.0 installed on it. Yay! Good times, right? Well, sort of. Even though it starts up fine, the phone is stuck at the 'Activate iPhone' screen. Since Apple has deactivated their 2G activation servers, there is unfortunately no way to legitimately activate an iPhone 2G. Which means we must turn to software modifications at this point.
I stumbled across a forum post on the MacRumors forums where hackerwayne mentioned he was able to hacktivate iOS 1.0 successfully using a modified version of iLiberty+. I started looking into it and found that iLiberty+ comes with a package to activate iOS 1.0.2 - 1.1.4, but without support for iOS 1.0.
I opened the script file, and noticed it checking iOS versions before applying patches. Somewhat haphazardly, I decided to modify the value it was looking for so that "1.0" would install the patch for iOS 1.0.2. Guess what... it worked!
I wasn't satisfied, though... I wanted the phone to be unlocked, to see if there was a chance it would work on my carrier (spoiler alert: it doesn't). The unlock only supports baseband 03.14.08 to 04.04.05, and since iOS 1.0 uses 03.12.08 it doesn't work. Using files from George Zhu's blog, I created my own script to reflash the bootloader to 03.14.08 (download here if you have any use for it). However the unlock didn't want to work on 03.14.08, so that seems to have been a wasted effort.
I also didn't feel right using the 1.0.2 version of lockdownd on iOS 1.0, so I decided to see if I could make my own patched lockdownd for iOS 1.0. I managed to find a fantastic post on George Zhu's blog that describes the differences between lockdownd patches by iOS version, and it lists the patches required for iOS 1.0 and 1.0.1. Sure enough, they are at different offsets than the one for iOS 1.0.2, so I decided I'd make my own Activation script for 1.0 and 1.0.1.
After some research, I figured out how to extract content from IPSW files and after a few minutes with a hex editor I had a patched copy of lockdownd for iOS 1.0. While I was at it I decided to extract and patch lockdownd for iOS 1.0.1 as well, in order to give iLiberty+ the ability to activate the full range of iOS 1 versions.
I also managed to find an app called iPatcher by iphone-elite, which should activate iOS 1.0 to iOS 1.1.2. I created a script that runs it (download it here if you like), however it doesn't seem to work. I may have done something wrong, if anyone is able to get it working please let me know.
After all this work, I decided to make a blog post about it in case anyone wants to replicate what I've done. I hope you enjoy it as much as I enjoyed working on it. :)
First you will need to restore the iPhone to iOS 3.1.3. You should do a DFU mode restore to ensure a clean, fresh install. It doesn't matter which version of iTunes or which OS you use to accomplish this. For reference, I'm using iTunes 184.108.40.206 on Windows 7 Home Premium.
NOTE: It's very important that you do not let iTunes sync the phone after restoring to iOS 3.1.3, otherwise the downgrade may fail and you'll have to start over again. To save yourself some hassle, keep an eye on the restore progress and as soon as the phone restarts, be ready to unplug it. Keep watching the screen (and pressing home to keep it lit) until it changes from the "Connect to iTunes" background to the battery icon. At that point immediately unplug it before iTunes has a chance to sync. You can now close iTunes and move on to Phase 2.
HILARIOUS: After the phone is done restoring, and if you have a valid SIM inserted, the iPhone may display the message "Waiting for activation. This may take some time." That's a bit of an understatement, considering Apple's no longer running activation servers for the iPhone 2G. :-/
Now it's time to prepare your Windows XP computer or virtual machine. You will need to download the iOS 1.0 firmware file, iTunes 220.127.116.11 as well as iLiberty+ 18.104.22.168. After installing iTunes and iLiberty, make sure you extract the Activate 1.0 - 1.0.1 payload into iLiberty's payloads folder. The default location is C:\Program Files\iLiberty\payloads.
Start iTunes 7.5 and connect the iPhone. iTunes will warn you that you need version 8.2 or higher, click OK. Put the phone into DFU mode. Once the phone is detected, hold Shift and click Restore, then select the iOS 1.0 firmware file.
iTunes will display "Extracting software", followed by "Preparing iPhone for restore". The screen on the phone will turn white, then display the Apple logo, and shortly afterward display the 'spinning' icon at the bottom of the screen. iTunes will go through the typical restore procedure, and after about 5-10 minutes or so, your phone should restart into iOS 1.0. :)
After the restore is done, iTunes will show a message saying you need iTunes 10 or higher (for which reason I do not understand). Close iTunes and move on to Phase 3.
TROUBLESHOOTING: If you get error 1604 and your phone displays the regular "Connect to iTunes" screen, it means your iPhone may have synced after restoring to iOS 3.1.3. Try the above steps once more, if you end up with the same result you should start over with a DFU mode restore to a fresh iOS 3.1.3 and be careful to not let iTunes sync it when the restore is done.
The first thing you want to do in iLiberty+ is update the address for the repo. Go to Tools, Options, and replace the old address with the new one:
Do not check anything on the main screen (Standard tab). Instead, select the Advanced tab, and then click the Refresh button. Then select the "Available On Repo" tab (at the bottom), scroll down until you locate "Reflash baseband to 04.04.05_G (BL3.9 only)", check it off and click Download.
Next, click the Local tab (at the bottom) and check off the following payloads:
- Activate 1.0 - 1.0.1
- Downgrade bootloader from 4.6 to 3.9 (if you are certain that your phone has bootloader 3.9 you can leave this unchecked -- it's harmless if you're on 3.9)
- Reflash baseband to 04.04.05_G (BL3.9 only)
- Unlock 03.14.08_G - 04.04.05_G
Cydia is included, however it's a very old version and not well supported as I'm sure you can imagine. It does work, but it sure doesn't like talking to the repo. There are also very limited options for software. I personally chose to leave it off my phone to keep the stock home screen.
When you're ready, click Go for it! After a couple seconds iLiberty should ask you to disconnect and reconnect the phone. After doing so click OK. You should then see a progress bar as the ramdisk is uploaded, and the status bar (at the bottom) will say "Sending ramdisk to device..." followed by "Booting ramdisk..."
Once it says "Booting ramdisk..." click the Other Tools tab and the 'Jump Out of Recovery Mode' button which should kick-start the process.
Pass 1 of iLiberty+ should now run, which looks like a lot of text scrolling on your screen. After 20-30 seconds your phone will reboot and display the Apple logo, followed by
2. iLiberty Pass
Wait for Pass 2 to finish (takes about 7-8 minutes for everything to complete), after which your phone will reboot. Everything should now be hunky dory. Enjoy iOS 1.0! :)