Method to Downgrade from iPhone 1.1.1 to 1.0.2

Note: This does not downgrade the baseband, only the firmware!

There is someone on the Hackint0sh forum that has found a way to revert to a previous firmware (but not the baseband). This seems to be verified. I'll update this when its appropriate...

This process has been dubbed the KMAC Method:

...should give credit to kmac and whoever is succesful using this should thank this guy...
...i'm still on 1.0.2., now i know there's something we can do just in case i take the plunge...
name this method as officially: THE KMAC METHOD:)

http://www.hackint0sh.org/forum/showpost.php?p=68776&postcount=92


http://www.hackint0sh.org/forum/showthread.php?t=9016
Link note: post linked is locked

There is also a page on the iPhone Dev Wiki of this as well:
http://iphone.fiveforty.net.nyud.net/wiki/index.php/Downgrade_from_1.1.1_to_1.0.2



Here are the instructions:

Updated the steps:

These instructions currently only work with iNdependence on the Mac. It will unbrick you iPhone -but- will not restore cellular service, only wifi.

Here are the steps:

1) Make sure you have a copy of the 1.0.2 firmware handy in ipsw and decrypted form
2) Reboot iPhone holding top (power) and home buttons *BUT* release the top button 10 seconds into it (right after the screen goes dark)
3) The iPhone screen will appear to be off, but start iTunes (latest version worked for me on the Mac)
4) Option+Click restore and select the 1.0.2 firmware ipsw
5) The phone will restart and error out at the end with an unknown error 1013, this is expected
6) Restart iTunes and let it get to the screen that says you have an invalid SIM
7) Launch the latest iNDpendence
8) Jailbreak the phone using a decrypted 1.0.2 (it will flash all sorts of error, but stick with it)
9) Activate the phone
10) It will show the SIM error but you should be able to get back in

I installed AppTapp afterwards along with the BSD subsystem and SSH, all working over wireless only.

So far, bbupdater will not revert the firmware.

Originally posted here: http://www.hackint0sh.org/forum/showpost.php?p=68829&postcount=107

The General has done this, and posted as well the steps he has done:

Confirmed. It works. I'm back in business. :)

The only thing I'm going to miss is the bluetooth headset battery indicator. :(

Here's what I did:

1. Plug iPhone in and sync iPhone, then close iTunes
2. Hold the Home button and power button until the screen goes black (around 8 seconds for me), release the power button but keep holding the home button.
3. iTunes will reopen when it detects the iPhone in recovery mode.
4. Holding ALT (on Mac, dunno in Windows) click Restore and choose the 1.0.2 firmware in ~/Library/iTunes/iPhone updates
5. It will restore, and throw an error message when it's done. Unplug your iPhone and close iTunes.
6. Download AppTapp 3.1 installer and run it, plug your iPhone in. It will not work, but it will take the iPhone out of recovery mode.
7. Open iTunes and sync your phone from the backup created in step 1.

Some notes:

The reports of wifi not working are wrong, mine works fine.
When I go to Settings -> General -> About it says my modem firmware is 04.01.13_G and that my "Version" is 1.0.2 (1C28)

This works, believe it. I did it, you can to. :D

Here is the steps of how to do this with the PC:

Thanks to a great find by KMAC, WE ARE NOW ABLE TO DOWNGRADE OUR PHONES!!!! I just wanted to make a simple guide for people with PC's to follow

Start iTunes and plug in your 1.1.1 phone

In 1.1.1, hold Power and Home buttons and count 10 seconds (your phone will turn off, just keep counting), release the power button but continue to hold the home button until your phone is recognized by iTunes. (phone screen will be blank)

A message will pop up and ask you to restore your iPhone. Holding down the SHIFT key, click on the restore button. Navigate to your 1.0.2 software
(http://appldnld.apple.com.edgesuite.net/content.info.apple.com/iPhone/061-3823.20070821.vormd/iPhone1,1_1.0.2_1C28_Restore.ipsw)

Begin restoring...

When it's done, you will get an ERROR, click OK. Your phone should show a yellow triangle. Leave iTunes running and run AppTap.

AppTap might encounter an error as well, however, it will bring your phone to the Activation screen. Once again, start iTunes, ignore all messages from it, and run AppTap. Now it will jailbreak your phone and install Installer. (You may have to retsart your PC after arriving at the activation screen if iTunes isn't recognizing your phone)

Simply use iASign or whatever you use to bypass activation.

Your phone is now back to 1.0.2.

(I am using iTunes 7.4.3.1)

WI-FI, calls, everything fully functional!

Posted here originally: http://www.hackint0sh.org/forum/showthread.php?p=68724


On the Hackint0sh Fourms, someone has claimed to of downgraded the baseband, this was the process this person used (This has not been confirmed):

6. Reflash Old Modem firmware using Putty.

(Elaborated)

Install SSh on Iphone using installer.app ot ibrickr or whatever you want. In ibrickr, i created a new folder called unlock, in this folder i uploaded bbupdater, ICE03.14.08_G.eep and ICE03.14.08_G.fls.

I then used Putty to connect to the iPhone and ran the following commands,

chmod +x bbupdater
launchctl unload /System/Library/LaunchDaemons/com.apple.CommCenter.plist
./bbupdater -f *.fls -e *.eep
launchctl load /System/Library/LaunchDaemons/com.apple.CommCenter.plist

After doing this i got an error saying failed to download fls image, could not verify or something like that. I restarted the iPhone and did the same thing again, the exact same commands as above and this time got no error.

7. Just use the Unlocking method of your choice, i used iBrickr and anySIM1.02

Thats it!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Original Thread: http://www.hackint0sh.org/forum/showthread.php?t=9027

first you wanted that thread locked, now you're directing traffic to it!!

first you wanted that thread locked, now you're directing traffic to it!!

Oi, because there are more and more people that are claiming this as true....it wasn't until it reached a certain point that this seemed more interesting. It could be a dead end, or it could be actually verifiable. I'm just posting it, for discussion. You cannot blame initial skepticism of this when others have though to of done this, though this thread wasn't deleted at that point.

Unless they can prove it, and if not, then this is a useless thread, and should be locked....

I quoted specifically here, that if they could prove it, than that thread was not useless. If it cannot be proven, then it should be locked. There seems to be multiple claims of it working, so it seems more possible than bunk, for the moment.

just thought you were a bit harsh on him. although not as harsh as the person who told him he was not welcome.

reading the thread over there now and seem as its succesful :-) now for the dev team to take this info and make it a one button process or something with a nice GUI lol... but i dont think i want to downgrade ... im ok with 1.1.1 especially since we figured out how to upload custom ringtones... but i would love to have the option to be able to do it. :-) you know just in case :-) lol

just thought you were a bit harsh on him. although not as harsh as the person who told him he was not welcome.

Well....I've read a few posts, that were proved false. I didn't shoot him from giving the idea, there has to be some proof of this in order for it to be told true.

Apparently someone has confirmed this on the Hackint0sh forums:

Thats confirmed

Kmac method WORKS.

We have a method to downgrade.

http://www.hackint0sh.org/forum/showpost.php?p=68752&postcount=77

Confirmed. It works. I'm back in business. :)

The only thing I'm going to miss is the bluetooth headset battery indicator. :(

Here's what I did:

1. Plug iPhone in and sync iPhone, then close iTunes
2. Hold the Home button and power button until the screen goes black (around 8 seconds for me), release the power button but keep holding the home button.
3. iTunes will reopen when it detects the iPhone in recovery mode.
4. Holding ALT (on Mac, dunno in Windows) click Restore and choose the 1.0.2 firmware in ~/Library/iTunes/iPhone updates
5. It will restore, and throw an error message when it's done. Unplug your iPhone and close iTunes.
6. Download AppTapp 3.1 installer and run it, plug your iPhone in. It will not work, but it will take the iPhone out of recovery mode.
7. Open iTunes and sync your phone from the backup created in step 1.

Some notes:

The reports of wifi not working are wrong, mine works fine.
When I go to Settings -> General -> About it says my modem firmware is 04.01.13_G and that my "Version" is 1.0.2 (1C28)

This works, believe it. I did it, you can to. :D

OK so will this work on an iphone that hasn't been unlocked? I am a bit confused. I have 1.1.1 on an iphone i've had since day 2.

excellent...it's called the kmac method! he's getting the credit.