Did you accidently upgrade your phone to 2.2.1, or worse 3.0 betas, without heading the advice to wait for an official dev-team release? Are you stuck with a phone that can’t be unlocked using yellowsn0w now? For some of you there may now be a solution.
3G Fuzzyband Downgrader is now available in cydia on jailbroken phones. Fuzzyband will allow you to downgrade from any baseband (2.30.03 – 4.26.08 as of the time of this writing) back to 2.28.00 the official unlockable version.
Unfortunately this will only work on early adopters phones. It requires bootloader version 5.8 found only in phones sold the first couple of weeks that the 3G was released. If you are unsure of your bootloader version, just download Fuzzyband, install, and run, it will tell you your current version, and whether you can downgrade or not.
For those of you who might be going, “huh?” let me explain a little about what the baseband is, and why you would want to downgrade it.
The iPhone is actually 2 devices, a phone or modem, and a computer. The computer portion of the iPhone has an operating system (OS), the currently released version is 2.2.1, with 3.0 coming out in a few months. The phone/modem portion of the iPhone also has an operating system, the currently released version is 2.30.03, or 4.26.08 if you are using beta 5 of OS3.0.
When you buy your iPhone from the store it’s locked to a carrier (AT&T in the United States where I reside). yellowsn0w was released by the dev-team to allow you to use the phone with any carrier (t-mobile, or overseas prepaid cards are an example). yellowsn0w currently only runs on modem version 2.28.00.
You may be saying “But Nic, I’m happy with my carrier, why would I want to unlock?”, and I would tell you that in a few months when a new iPhone is released, you may want to sell yours, either on ebay or to a friend. A phone that can be used on any carrier is worth about double the amount of money that a phone locked to say AT&T is. A quick scan of ebay shows unlocked 3G iPhones selling for $500.00 to $700.00 (USD).
If you still don’t understand why this app may be essential to you, then it probably isn’t and you can disregard this post altogether 
. For proper disclosure I must admit that this app is a joint effort between myself and Dustin Howett (DHowett), and is an extension of an exploit found and explained by George Hotz (geohotz).
If you have any questions regarding the application, feel free to ask them here in comments, or email fuzzyband@peacefulinsanity.com.
My baseband is too new =( No new iPhone for me
You mean your bootloader is too new? ANY baseband can be downgraded as long as your bootloader is 05.08 (5.8)
My Bootloader is 06.02 ;(
So there is no way to downgrade the bootloader???
I can’t find this app on Cyna. Am I missing a certain source?
The app is in BigBoss’s repo, which is one of the standard sources, refresh and search for
3G Fuzzyband
I have the source “BigBoss & Planet-iPhone” as a source. Is this the source I need or are we talking about another one? Because I have been refreshing and searching all day and can not find this app.
Greetings.
I would like to enquire as to will there be a basband downgrader for the 6.02 bootloder?, which is what I have on my Iphone
Hi,
Great app, too bad mine is 5.09, any chance in the future this bootloader version may be supported?
I will reiterate what MuscleNerd has stated (from the Dev-Team). I doubt there will be any chance of downgrading from 5.09, as that bootloader has already been replaced with 6.02, and that replaced w/ 6.04. I think more likely you will see an exploit found in the 4.xx basebands that are being shipped with 3.0 software update.
But, if an exploit is found in those basebands, or in the future bootloader (6.04), you will not see it released to the public until AFTER the new 3g iphone is released. Releasing such exploits would be suicide to unlocks since it would give apple enough time to fix the hole and stop the exploit before the phone makes it to mass market.
If you are stuck without an unlock, I think after the 3.0 software and the new 3g iphone hardware is released you will see either another version of yellowsn0w to support the new basebands, or a new software unlock, hopefully at a much lower level like that found on the 2g making it permanent.
Wonderfull Nic,
Thanks for the reply, It was my first time unlocking an iPhone ( the same day I bought it from the Comcel store down here in south america, Colombia ) and the first one didn’t seem to work ( with Pwnagetool ), afraid I bricked it I restored the phone to the latest firmware, then proceded to jailbreak again and now its jailbroken and working great .. except yellowsn0w.. i’ve since jailbroken other friends phones and installed yellowsn0w with great success. I’m excited about the 3.0 OS and accompanying hacks.
Cheers
thanks for the kind info but my question is , what if someone has an iphone with a bootloader version 5.09, i have an iphone with this boot loader , i dont knw what to do, my phone is not working, i have jailbroken it but still i got ” no service ” instead of my carrier`s name..
my currently firmware is 2.2.1″5H11″ and modem firmware is 02.30.03… plz let me knw if u have any solution for my phone to work correctly with othr carrier as well , other than AT-T.
MG,
It seems like only turbosim card the can assists you.
I do have the same issues till I got the turbosim then my Iphone starts working.
However, 3G is no more working.
Alan
Alan,
Are you saying that if one used turbo sim to unlock the iPhone, 3G does not work? Does that happen with all turbosim cards or there are few that come with 3G working?
Please explain. Thanks.
Any news on unlocking the 06.02 bootloader ?
i have i phone 3g 2.2.1 with 6.2 boot loader any help or can i use red snow
i have iphone 3g 2.2.1 with 6.2 bootloader any help or can i use rednow
Any news on unlocking 5.9 bootloader now that they released the 3.0? How do I know which of the xxxxsnow software to use? Will they come up with a new fuzzyband that downgrades 5.9 or a new xxxsnow software that will unlock it?
Turbo SIM does not work for my carrier in Brazil! Have an ATT USA 2.30 5.9. THANKS A MILLION!
my iphone do not detect my Sim card
is a iphone 3g 16gb
3.0 firmware installed.
and jailbraked with UltraSn0w
and it dont detect any wifi
i dont know what’s wrong
what i need to do?
how did u get ultrasnow?
I have Iphone 3g 2.30 bootloader 6.04 ……i am not able to downgrade today i tried ultrasn0w but no luck can any one help
Worked perfectly!!! Thank God! Now I don’t have to use the turbo sim. Thanks Dev Team.
@ Kev: how did you succeed? did you had a > 5.08 baseband version?
@ Kev: how did you succeed? did you have a > 5.08 baseband version? thanks
Antonio, I had the same problem with the same baseband but I have just unlock my iPhone 3G today using a new tutorial.
http://www.iclarified.com/entry/index.php?enid=2311
It’s very easy to follow.
Wish you luck.
Kiskeya
Hi Sir
Can you pls help me?
I got iphone 3g – 8 g with version 2.2.1 baseband 02.28.00
After I upgrade by iTunes to 3.0.1
After jailbreak downgrade back to OS 2.2.1 and baseband ice2 04.26.08 boot version 06.04 G2M3S2
I install your fuzzyband downgrader 1.0 and say not supported
(Sorry this software will only work with baseband bootloader 05.08
My iphone still can not use any sim card the carrier say NUL NUL
Can you help me the way to downgrade back to 02.28.00?
Regards
Best Regards
Vitor Costa Henriques
chiefelec@mvminerva.com
Hi
dont go for a down grade….instead after jail break just insatall Ultrasn0w and restart the phone….all sims will work…u need not downgrade follow the link for detailed instructions
http://www.quickpwn.com/2009/06/unlock-iphone-3g-30-with-ultrasn0w.html
Hi all,
thanks Kiskeya!
Actually, I solved this issue using UltraSn0w and it worked fine: now, my Iphone is jailbroken and sim unlocked!
@ Vitor:
look for ultrasn0w on Google and you’ll find a guide in the official site of dev team. My Iphone is the same as yours and it finally worked.
cheers
Antonio
my iphone 3g is on bootloader 6.04 how long do i have to wait for fuzzyband to work on 6.04 and i heard that fuzzyband update every 2 fridays is this real?
Hey Michael.
Please let me know if you found any solution for this problem.
roeea2@gmail.com
@ Michael
Did u find a solution for the baseband bootloader 6.04?
I also have an Iphone with bootloader 6.4! Any solution how to downgrade it?
Hi everyone, I also have the same problem of bootloader 6.4. Please do share some solution because im unable to use it as phone.
i have the same problem
i have the
3.0 os version
05.11.07 Baseband
06.04 Bootloader
plz help me if someone know how i can unlock it
Hi all, i got Iphone 3G, bootloader 6.4 , Baseband Version 5.11.7 and OS version is 3.1.2, is there any help for me …………..please help me out. thanks to all
is there any way i can downgrade it any lower version and use it as phone other then paper weight…………..please help……
does turbo sim work for a 6.02 5.11.07
thanks
How do I unlock my iphone?
Bootloader Version : 06.02
iPhone OS Version : 3.1.2
Modem Firmware : 05.11.07
Vishal
did you able to unlock your iphone? mine has same prob as you and as of today– no service, apply shop says that no update from the APPLE dev team to solve the issue.
if you have a fix– pls share with thousand of folk around
cheers
Heya folk,
there is already solution to the no service/no signal of 3G iphone..
download blackrain and install to the PC, plug in your iphone to pc- then wait till itunes open– close it.. open the blackrain– click the icon–make rain–wait till few minutes..
when Iphone restart– check the blackrain on the Iphone-open up, Iphone should have wifi connrection then install the-cydia, rock, and SNOW– Snow is the one that can make the Iphone software to be running-within few min after the snow is install– Iphone should have carrier/signal already..remember–this is all FREE… don’t pay any cents– u need only internet connection
For the unlock Iphone 3G– it should be unlock using teh redsn0w 1st before the blackrain– have fun..
Thank to the people who develop the blackrain– You’re the men..
Do any one please know of solution to “No carrier/signal” problem?
Bootloader Version : 06.02
iPhone OS Version : 3.1.2
Modem Firmware : 05.11.07
Thanks for any help
any news on the bootloader 6.2?? will it be ever downgradeable? im stuck with the 5.12.01 BB and 3.1.3FW.. i jailbroke it with redsn0w but no unlock yet.. is there ever going to be one?? i need some hope
) thx
short question, does anybody know if it`s possible to format an iphone completely, with any softwaretool f.e., including the modem fw, or is the modem fw locked with the hardware and not at all deletable? (like i guess it`s the case with the bootloader…)
(i guess that i`m not the first who thougt about that solution to unlock an iphone with updated modemfw)
anybody who tried this?
iphone 3g, fw 3.2 custom jailbraik, modem fw 5.12.01 bootloader 6.02
That s nice app . But y they don create fuzzy for window version ??? It ganna be easier for downgread……..
i need to unlock my iphone which has 3.1.3
it has Boot loader 06.02
is there a solution out yet?
thx
no solution
I wasted over 4 days instaling and uninstaling firmwares and used every available software … nothing. It’s downgraded from 3.1.3 to 3.1.2 however now there is also the issue of downgrading the BaseBand boot-loader. Tried with Fuzzyband as per the instructions found on the net and is not working cause of the 06.04 version of the boot loader. Any help would be appreciated.