How to Downgrade iOS 4.1 to 4.0 on iPhone

By Sandip Dedhia on July 15, 2010
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iOS 4.1

We have already published guides on how to jailbreak iOS 4.1 on iPhone 3G & iPod Touch 2G (non-mc model). Now that you have already upgraded to iOS 4.1 only to find out Apple’s claim on fixing antenna issue is fake or aren’t impressed with iOS 4.1 beta then here is our working guide to downgrade iOS 4.1 to 4.0 on iPhone 3G, 3GS & iPhone 4.

But keep in mind that by downgrading iOS 4.1 to 4.0 your baseband won’t change and your iPhone will be locked if you are not on supported carrier. Hence unlockers must stay away from iOS 4.1 until iPhone dev team comes up with iOS 4.1 unlock tools.

Stuff you will need

1. iTunes 9.2 (latest iTunes)

2. Stock iOS 4.0 Firmware

3. iRecovery (Mac)

4. LibUSB Library Package (Mac)

5. iRrecovery & LibUSB Library Package (Windows)

Downgrade iOS  4.1 OS to 4.0 on iPhone 4, 3G & 3GS

1. Download iOS 4.0 firmware file.

2. Connect iPhone to computer

3. Now Start iTunes 9.2 and Windows (Alt Key+ Click Restore) Mac (Hold Option + Click Restore), Now manually select iOS 4.0 firmware.

4. During the restore process you will get an 1015 error. Don’t worry, that’s normal. Just click on Ok and close iTunes.

iTunes Error Code 1015

5. Now open terminal on Mac/ Command Prompt on Windows and type following commands

cd Desktop

. / iRecovery -s

setenv auto-boot true

saveenv

fsboot

exit

iRecovery
iRecovery Last Command fsboot

6. Now unplug your iPhone and turn it off by pressing the home+power button.

7. Once it is off, turn it on by pressing the power button. Plug-in your iPhone and load iTunes to continue with the activation.

That’s it we have successfully downgraded iOS 4.1 to 4.0 on iPhone. iPhone 3GS users can only downgrade to firmware 4.0, unless you saved your ECID files to a earlier version.

Please Note: Do it at your own risk, we will not be responsible for any damage that may arise to your iPhone by following above guide.

Posted in , | Tagged , , , , , , | 36 Responses
Sandip Dedhia

Sandip Dedhia

Sandip Dedhia is the founder of Blogsdna.com, he loves to write on technology, gadgets & web services. At Blogsdna you can read his Windows & freeware software related articles. He is on twitter too @sandipnd View author profile

  • Brice J

    Using command prompt doesn’t seem to work for me when i type in iRecovery. It just says iPhone not found. And I have to type in ‘iRecovery -s’ instead of ‘./iRecovery -s’ or nothing happens at all, it’s just invalid. Also, Alt key + Restore does not manually open up restore, i have to press shift + restore.

  • Aaron

    those commands dont work in prompt for windows maybe it`s only for mac

  • Eric

    What about the iPhone not found error message (found on a mac)?

  • Rick

    Hi,
    You need to put the iPhone into DFU mode first too:

    http://limitededitioniphone.com/how-to-put-the-iphone-into-dfu-mode/

  • Jhon

    Hi, i have an iPhone 3G. I did the whole process, including the DFU mode. But in step 7 iTunes show me the same error “this device isn’t eligible for the requested operation”. I’m using iTunes 10. Can somebody help me? Thanks.

  • Pingback: Jailbreak iOS 4.1 Beta 2 on iPhone 3G & iPod Touch 2G with Redsn0w 0.9.5 Beta 5()

  • Hoko

    iRrecovery & LibUSB Library Package (Windows), made me lose my mouse and keyboard!! Somehow it’s not working anymore, anyone else has this problem? And how do I fix it! aghh

  • Pingback: Downgrade iOS 4.1 to 4.0 on iPhone | Nitheesh Poojary.()

  • Tom

    Hi, Ihad the same problem on Win 7. Just reboot and go to last good configuration. After puting devide in to DFU I got the msg: Got USB No Iphone.Ipod found. Anyone any ideas?

  • TOM

    I got it to work by puting the installer in compatybility mode with WIN XP (SP3). Does the job! Thanks

  • Hi,
    I got “This device isn’t eligible for the requested build.”

  • Albert

    It worked for me, but I had to:

    -get rid of the spaces in . / iRecovery -s
    (write ./iRecovery -s)

    -dubbelclick the libusb2 package and install before typing the terminal commands

    Thanks!

  • Darryl

    Made me lose my mouse, keyboard, internet, and sound. do NOT download the Win32! I have to use my friend’s PC to post this since I can’t access my PC anymore, I hate to risk losing changes.

  • hernandez

    i got stuck at veryfying restore

  • Sandra

    Ok I got all the way to error 1015 and then rebooted it, it’s asking me for a at&t sim card to activate it, but when I put one in it didn’t recognize it and the background is the screen that the recovery mode shows. What do I do?

  • Angel

    At least you guys didnt end up having your iphone/ipod just not connect to the computer at all any one know how to fix this?

  • gabriel robinson

    can anyone help me do this?:/ i cant

  • vinay jain

    hi frnds dis is vinay jain from india……i can down grade ur iphone 3g ios 4.1 to 3.1.3 or any

  • vinay jain

    dis is vinay jain ..i can downgrade iphone ios 4.1 to 4.0 or 3.1.3 or any oder…

    my id is vinayjain8055@gmail.com and my contact number is
    for oder countries +919493923007

    for indians 09493923007

  • just restart windows 7 or what every you have, if you lose your keyborad or mouse or both! it happed to me too

  • don

    i accedentlly upgrade my iphone tmobile to version 4.1 ang my phone been locked how can i unlocked it.help me please……..thankyou.

  • PS

    Is it possible to downgrade a new iphone 4 factory preloaded with 4.1?

  • Dddd

    it happened to me, try uninstalling irecovery and libUSB, if it still won’t work, then perform a system restore…just like I did :)

  • Dheeraaj

    what about Windows Commands?

  • Dheeraaj

    what about Windows Commands?

  • chris d

    About 7 moths ago I used jailbroke my i phone. I just updated the software to 4.1 and it erased everything. Is it possible to jailbrake my I phone using this new software?

  • Jp Jpgupta

    is there any risk in downgrading ios 4.1 to 3.1.2?

  • Slhokeperez

    That happened to me and I had to recover it to the latest firmware. That fixed that problem.. But becareful if you are trying to unlock a 3gs, there is no unlock for 4.1 yet.

  • teja

    is it possible to downgrade 3gs 4.1 to 4.0.1

  • Meg_babykoryusei

    i have my iphone 4 here its in recovery mode..ive tried many times press power+home ive tried that options many times but NOTHINGS APPEAR ON MY SCREEN…. WHAT SHOULD I DO WITH THIS…PLEASE I NEED HELP….PLEASE.I DONT WANT TO RESTORE IT BECAUSE MY APPICATION WILL GONE

  • Muamedali

    hi..can u pls help me to do dis… send me ur no.. i will call u

  • Muamedali

    hi..can u pls help me to do dis… send me ur no.. i will call u

  • shanks

    I can’t get through with this. If put in DFU mode, my computer doesn’t even recognize my iphone, if put in recovery mode, the phone just restars after I’ve gone through installing the old firmware, so I don’t get the chance to get it out of R mode with Irecovery or recboot. And as said, in dfu mode, it does not recognize the iphone.

  • shanks

    Someone with knowledge about this who can share? Thanks.

  • Amandeep Singh

    Help me do this,

    Please email me on singh.amandeep.302@gmail.com

  • Alibaba

    Hey. I need ur help. My mouse and keyboard aren’t working. I want to uninstall the iRecovery. But problem is, I couldn’t move my mouse and use my keyboard. So how can I do all these things? Please help me.

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