UltraSn0w Unlock Gets Updated to Support iOS 4.3.1

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Posted April 10, 2011 at 12:57am by iClarified

The iPhone Dev-Team has announced an update to UltraSn0w that makes it compatible with iOS 4.3.1 for basebands previously unlocked.

We’ve pushed out the 4.3.1 compatibility fix for ultrasn0w in Cydia — it’s now at version 1.2.1. If you’re not already at 4.3.1 and you need the unlock, please be sure you understand how to get to 4.3.1 using a custom IPSW that doesn’t update your baseband. There are lots of guides for this (like at iClarified.com).

This isn’t a new unlock! It’s to allow those who are already unlocked to use FW 4.3.1. It also fixes the signal bar issue for those who aren’t using the unlock but retain an older baseband intentionally.

After installing UltraSn0w 1.2.1 you should reboot your device by using the normal power button and "Slide to Power Off" swipe. USA T-Mobile users need to disable 3G mode in Settings:General:Network.

To upgrade to iOS 4.3.1 without upgrading your baseband you can use one of these tutorials
● TinyUmbrella iPhone 4 (Windows, Mac)
● PwnageTool iPhone 4 (Mac)
● PwnageTool iPhone 3GS (Mac)

You can find our UltraSn0w unlock tutorial here.

UltraSn0w Unlock Gets Updated to Support iOS 4.3.1

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Alan - June 14, 2011 at 2:32pm

I have a iPhone 3G (originally on Orange France) and wondered if I could unlock it. Jailbreaking is no problem but unlocking with UntraSn0w doesn't seem to work: iOS version - 4.2.1 Baseband - 05.15.04 There don't seem to be any references to this baseband anyone got any ideas? Regards A

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George Belivanis - April 14, 2011 at 9:24am

hey guys, im in serious need of help. i upgraded my iphone 3gs to ios 4.3.1 and the jailbroke it using a tutorial on the iclarified website. everything was running smoothly until i went to unlock it from the current provider but it wouldnt let me because it had baseband 5.16.2 i am absolutely lost and ive been reading up on blogs which say that now its useless and i cat do anythin with it...

hellinwtc - April 15, 2011 at 12:20pm

if you upgrade 4.3.1 using the official ipsw then you baseband will be upgrade as well so until this point you can't unlock using ultrasn0w coz it does not support new baseband

francios - April 29, 2011 at 4:45am

is there any alternative? beside ultra snow? please i really need to unlock it...

LOCO - May 22, 2011 at 3:25pm

I got the same problem. Modem Firmware 5.16.2 and can't downgrade. What about the Gevey Turbo whatever? Could they be the solution?

dev team is not being paid by apple. - April 11, 2011 at 9:31pm

http://cutyoursim.com/.......hummmmm $170??? someone is making a profit from other people... AND... using what? a calculator??? made by??? c'mon... this is crack, I said the Dev team is being paid by apple, sorry, they are being paid by other people... because if they comes put with a solution... then this people will lose money, unless the devteam is behind this...

muthy - April 11, 2011 at 8:37am

i have iphone 4 which i baought from uk with version 4.2.1 baseband /03.10.01. guys pls advise to unlock the network what i am suppose to do

canard111 - April 11, 2011 at 8:51am

Depending on your UK network, you may be able to pay them to unlock it for you - talk to them. If not, then all you can do is save your SHSH for the current jailbreakable FW (4.3.1) with Tiny Umbrella and wait for the unlock. There is no current unlock available for 03.10.01, and no ETA.

poolkiller - April 10, 2011 at 8:27pm

I have iPhone 4 with 4.2.1 and baseband 2.10. I know I can't unlcok yet even I upgrade to 4.3.1. My questions is, if I use pwntool to upgrade to 4.3.1 and keep baseband on 2.10. If I still install Unltra sn0w, 1.2.1. Would that take the 1 signal bar issue away? Thanks if someone can help...

canard111 - April 11, 2011 at 2:16am

There is absolutely no point for you to install UltraSn0w if you're on that baseband. Unless you really, really need to go to 4.3.1 for some reason, I would just stay put on your current firmware and wait for the unlock. Save your SHSH for 4.3.1, though!

SlasherKG - April 10, 2011 at 6:37pm

Ok, so there seems to be an issue with ultrasn0w 1.2.1 and baseband 1.59.00. The signal bars are working fine, but Visual VM and MMS no longer work. More reports here: http://forums.macrumors.com/showthread.php?t=1134161 I have disabled ultrasn0w and both Visual VM and MMS are working, but of course the signal bar issue is back. Can anyone here confirm or have a fix?

SlasherKG - April 10, 2011 at 6:59pm

Ok, after reinstalling and powering off and back on, both VVM and MMS are working.... Maybe something that happens over time or after further reboots, I'll keep an eye to see if it happens again

YIN - April 11, 2011 at 12:04am

My VVM still does not work no matter what I did - reinstall ultrasnow, power on/off a few times. Not sure why you fixed it.

famleon - April 10, 2011 at 4:18pm

and as I said... The dev team is being plaid by apple, or you can purchase a factory unlock, Verizon or, AT&T, that is it that are the options, because the gevey does not work in all the countries and provide full support...what I can say is that....DEV TEAM IS SOLD TO THE BEST PAYER!!!

bowzer - April 10, 2011 at 7:16pm

You're out of your mind.

umer - April 10, 2011 at 3:16pm

you can see same tutorail here too.http://www.fasterpony.com/unlock-iphone-4-3gs-ios-431-ultrasn0w-121-complete-guide/

Leandro Fonseca - April 10, 2011 at 2:34pm

Will this upgrade to 4.3.1 and unlock help those with iPhone 3GS using iPad baseband (06.15.00) to fix the GPS problems? My GPS works, but it does not locate me with enough precision to be useful. Its is locating me with an error of hundreds of meters, what makes impossible to use from routes. It has been working this way since I upgraded to 4.2.1 and iPad baseband for unlock (06.15.00). Anyway thanks to the dev team for keeping up...

Tan soon yik - April 12, 2011 at 12:36pm

Unlock

rbs2000 - April 10, 2011 at 11:17am

Hi So if I'm on att i dont have to worry about this right ?

Thatsdileep - April 10, 2011 at 10:02am

I hav a 3GS with 5.15.04. Will this ever get an unlock. Don't want to upgrade to 6.15.0.

KAi - April 10, 2011 at 7:34am

Is there any unlock coming soon for FW 3.10.01 (iPhone 4) ?

bjarteru - April 10, 2011 at 5:56am

If my Iphone 4 has modem Firmware 04.10.01... i have done something wrong and can not unlook my phone.. is that correct?

canard111 - April 10, 2011 at 7:31am

Your baseband is unfortunately not unlockable yet. This particular UltraSn0w is for current unlockers at 1.59 who wish to upgrade their FW to 4.3.1 while retaining their current unlock. You can't downgrade your baseband.

bjarteru - April 10, 2011 at 8:45am

Are there many basebands between the one that is unlocked today and the one i have? Do you think there will be an unlock for my baseband, and if so.. when do you think it will come?

canard111 - April 10, 2011 at 5:27pm

You should go to the Dev-team blog at blog.iphone-dev.org/ - that's the best source for info on the jailbreak/unlock scene. Also, check out Musclenerd and Sherif Hashim on Twitter - those guys are the actual source of the latest unlock news. 1.59 BB came out with 4.0 and 4.0.1 FW. Since then, we've had 4.1 FW with 02.04.10 (from mid-September), 4.2.1 FW, and now 4.3 and 4.3.1. Hard to say, if or when an unlock will come. Dev Team never gives ETA's and you will only irritate the more experienced bloggers by asking for an ETA. This is apparently a tough one so far. I've been waiting since September, but because I know nobody owes me anything and if it comes, it will come for free - I'm patiently using my ip4 as a fancy ipod touch until an unlock hits.

bjarteru - April 11, 2011 at 4:25am

Thanks, it was not my intention to irritate anyone. Sorry if i did !

canard111 - April 11, 2011 at 5:45am

No worries! Just giving you a heads up for the Dev-team blog, that's all. Good luck.

Daniboy_De - April 10, 2011 at 5:27am

Thank's a lot, wonderfull job from dev team and the others helperd, thanks

fenrry - April 10, 2011 at 3:43am

Silly question, what about ppl running the old 3G, can they update to 4.3.1 (no BB upgrade) and unlock?

Josh - April 10, 2011 at 5:18am

The iPhone 3G is does not support the iOS version 4.3.1 so no. But the iPhone 3G is permanently unlocked.

badm0nkey - April 10, 2011 at 6:53am

Well, I have an old 3G, and 4.3.1 including ultrasn0w up and running (no multitasking, no custom user wallpaper)! It's a *little* slower than with iOS 3.x, but sadly i cannot go back because I only have these SH-files for 4.0 upward. I'm a o2 Germany customer, for what it's worth.

dan - April 10, 2011 at 8:26am

I have an iPhone 3G with Firmware version 4.1 and woks really great. So if you have the shsh for 4.0 and up I recommend you to go to this version, at least the speed is better than 4.3.1. And you cn use the cutom wallpaper.

Suril Vithalani - April 10, 2011 at 2:37am

Thanks a lot :)

joshwua - April 10, 2011 at 1:30am

ugh always pawnage tool, will sn0wbreeze work for us windows users? If not time to implement an upgrade.

Frank - April 10, 2011 at 3:08am

Why not use TinyUmbrella then RedSn0w. Both have Windows versions...

Keena - April 10, 2011 at 1:25am

;( No luck with my 3.10.01. I guess there is no way to unlock 3.10.01

joshWUa - April 10, 2011 at 1:28am

Gotta have patience (＾ｰ^)ノ

mag - April 11, 2011 at 12:06pm

just get gevey turbosim. I just bought it off at ebay and it worked like a charm. I'm done waiting for dev-team. I appreciate their hardwork. But, I can't wait any longer.