Downgrade baseband 05.12.01 to 04.26.08Last week I wrote about downgrading iPhone firmware 3.1.3 to 3.1.2 using an old trick. Unfortunately, this hack worked for downgrading the firmware but it didn’t help downgrading the 05.12.01 baseband that comes with firmware 3.1.3 and makes it impossible to unlock the iPhone.

If you accidentally updated your iPhone 3G to 3.1.3 and lost your unlock, you’re in luck! There is now a way to downgrade iPhone baseband 05.12.01 to 04.26.08 in a few simple steps thanks to Fuzzyband, an application available through Cydia.

Please note that this only works with the iPhone 3G on OS 3.1.3 with baseband 05.12.01 and the older bootloader 05.08. Let me repeat this so it’s clear. This trick will only work for iPhone 3G 3.1.3 baseband 05.12.01 with bootlloader  05.08. This will not work for the iPhone 3GS.

If you’re not sure about your bootloader, simply download and launch Fuzzyband and it will give you more info about your bootloader.

How to Downgrade iPhone Baseband from 05.12.01 to 04.26.08

Step 1: In order to downgrade your iPhone baseband from 05.12.01 to 04.26.08, you must first jailbreak your iPhone using RedSn0w, PwnageTool, or even Sn0wBreeze.

Step 2: After jailbreaking, launch Cydia, then search for and install Fuzzyband.

Step 3: Launch Fuzzyband then tap “Downgrade”, which will start the downgrading process.

Step 4: Reboot your iPhone.

Congrats, you successfully downgrading your iPhone baseband from 05.12.01 to 04.26.08. You should now be able to unlock using UltraSn0w. If you’re not sure how to do that, check out my tutorial on how to unlock iPhone 3.1.3.

  • Jake C.

    Iphone 3g Baseband of 05.12.01 with BL 06.04 jailbroken using redsn0w…. is there any unlock released for it as of now??? I’ve been in Marine Boot camp the ast 3 months sooo fill me in step by step please

  • Samy

    Yes there is

  • Norb

    Is there a unlock solution for the 3G 06.04?

    if yes, pls explain

  • Arman

    a buddy should explain us how to unlcok 3g 5.12.01 baseband without wifi plzz.the wifi is greyed out.just name the software to start.

  • mario

    So, here’s the way to unlock your iPhone with UltraSn0w 0.93 without an internet connection

    Download the ultrasn0w 0.9.3 in zip format and extract it; in there are 2 *.deb files (ultrasn0w 0.9.3.zip)

    Now, what you need, it’s a jailbroken iPhone . Meaning the phone was jaibroken using redsn0w, snowbreeze or pwnagetool. If the phone was jailbroken with blackra1n or spirit, then you have to install afc2add via Cydia … but you can’t do that since you don’t have wifi :-).

    Anyway, if requirements above are meet, you need to transfer the *.deb files and put them in private/var/root/Media/Cydia/AutoInstall. If the Cydia/AutoInstall directory is not there, then you create one. You can do this using iPhoneBrowser or iFunBox.—(i made it with ifunbox)

    Once it’s placed there, you need to restart your phone couple times, the 1st for Cydia to install the packages and the second to Ultrasn0w start to work. May have to reboot a 3rd time. I can verify it works on 3g 3.1.3 with 5.—(restarted 4 times)

    Read more: http://www.megaleecher.net/How_Unlock_iPhone_Using_Ultrasn0w_Without_WiFi_Or_Internet_Connection#ixzz11kjBmjal

  • razique

    how to downgrade baseband from 05.14.02 to .05.12.01.

  • razique

    help me to unlock my iphone 3g.
    having confg.
    2) Bootloader Ver: 05.09
    3) Baseband Ver: 5.14.02
    4) iPhone OS ver: 4.1

    • You need first to jailbreak your device using redsnow, pwnage tool, snowbreeze.Then search for a step by step tutorials to unlock your iPhone 3G using ultrasn0w.

  • hesam

    help me to unlock my iphone 3g.
    having confg.
    2) Bootloader Ver: 05.09
    3) Baseband Ver: 5.14.02
    4) iPhone OS ver: 4.1

    not supported

  • I am using an iphone 3G. Unfortunately i have upgraded ios into 4.2.1 now it’s baseband 05.15.04. After jailbreaking wi-fi is not working so i can not download utrasnow unlock. what i have to do now to unlock?

  • Laurent

    What to do with great care! its not working with all baseland.
    personally I’m using a bootloader with 6.2_M3S2 baseland 06,15,00.
    and not work.
    I remain patient to find the gps mode on the iphone 3G

  • My 3GS is now with 4.2.1 iOS and baseband 05.16.02. Is there a way to unlock this baseband? Or is thre a way to downgrade the baseband?

  • juankalmao

    I have a 3g with these characteristics
    4.2.1
    15/05/1904 6.2_M3S2-BL
    I have read that firmware 3.2.2 is releasable ipad and the tutorials do not speak the bootloader is not mentioned in Teory what they talk to me is that this firmware to restore the baseband up to 06.15 in the baseband if XX is releasable but not if the bootloader is changed ..
    could someone tell me something about it thanks God bless

  • appcrazzy

    I have iPhone 3G with following config and want to unlock the same.
    1) iPhone 3G
    2) Bootloader Ver : 6.02
    3) Baseband Ver: 5.15.04
    4) iPhone OS ver: 4.2.1.
    if i jailbreak the iphone with Redsn0w
    and upgrade my baseband from 5.15.04 to 6.15.?? , i suppose that, i will be able to unlock the phone.
    But after jailbreaking and unlocking, if i press restore button on iTunes, what will be the future consequences ? will it be dead iPhone or i will be able to reprocess it to jailbreak & unlock ?