can i unlock iphone 3gs 4.3.4?

pker886

macrumors member
Original poster
Apr 4, 2010
93
0
You would have to upgrade to the iPad baseband and use the latest version of redsn0w. The jailbreak will be a tethered one though.
I have used redsn0w 09.8b3 to load firmware 4.3.4, but there don't have install ipad baseband option.
 

pker886

macrumors member
Original poster
Apr 4, 2010
93
0
I have download that redsn0w, but it won't even load the firmware 4.3.4
 

awadeee

macrumors 68020
Jan 21, 2011
2,146
0
Canada
it won't let me restore back to 4.3.3
Did you successfully install the iPad baseband?

There are two possible reasons it won't let you restore downward:

a) You don't have blobs for 4.3.3.

b) You're trying to restore to stock firmware which is impossible with the iPad baseband. You need to use custom.
 

pker886

macrumors member
Original poster
Apr 4, 2010
93
0
It don't have ipad baseband, also when i got this iphone it's on 4.3.4.
 

iphone705

macrumors newbie
Jul 21, 2011
6
0
pker886, i may have solution for you. i was in the same boat as you, i bought an iphone 3gs with 4.3.4 baseband 5.16.02. Of course i don't have SHSH to restore older firmware.

I was able to upgrade the baseband to 6.15.00 by playing with redsnow 0.9.6.rc18 with 4.3.3 firmware. But since your on 4.3.4, ultrasnow will not work even you have updated to 6.15.00 bb. You will just get no service. Ultrasnow needs to be updated to recognize 4.3.4.

But there's another way to unlock it. You have to downgrade it to 4.1. It seems apple is still signing 4.1 firmware, or the hosts file trick may have allowed itunes to confirm/install it. Since mine was on 6.15 baseband, the 4.1 restore ended with 1015 recovery loop. My fix was to jailbreak it with 4.1 to make the system complete the 4.1 restore. The phone got jailbroken, and it successfully downgraded to 4.1 but safari and cydia are not working. So i jailbreak it again with 4.1 with ipad baseband, just to make a clean install.

I hope this would help...i was searching for days and i found someone from another forums suggested downgrading to 4.1.
 
Last edited:

pker886

macrumors member
Original poster
Apr 4, 2010
93
0
so i have to downgrade to 4.1? But it won't let me load the 4.1 firmware to install.
 

iphone705

macrumors newbie
Jul 21, 2011
6
0
So far, i haven't found a way to unlock with 4.3.4. Since now i downgraded to 4.1, im able to use my international sim. I was just doing trial and error until i was able to downgrade.

You may want to search "downgrade 4.3x" , it explains how to trick itunes in signing firmware (wont work with 4.3.3 but worked on 4.1) by modifying hosts file.
 

awadeee

macrumors 68020
Jan 21, 2011
2,146
0
Canada
pker886, i may have solution for you. i was in the same boat as you, i bought an iphone 3gs with 4.3.4 baseband 5.16.02. Of course i don't have SHSH to restore older firmware.

I was able to upgrade the baseband to 6.15.00 by playing with redsnow 0.9.6.rc18 with 4.3.3 firmware. But since your on 4.3.4, ultrasnow will not work even you have updated to 6.15.00 bb. You will just get no service. Ultrasnow needs to be updated to recognize 4.3.4.

But there's another way to unlock it. You have to downgrade it to 4.1. It seems apple is still signing 4.1 firmware, or the hosts file trick may have allowed itunes to confirm/install it. Since mine was on 6.15 baseband, the 4.1 restore ended with 1015 recovery loop. My fix was to jailbreak it with 4.1 to make the system complete the 4.1 restore. The phone got jailbroken, and it successfully downgraded to 4.1 but safari and cydia are not working. So i jailbreak it again with 4.1 with ipad baseband, just to make a clean install.

I hope this would help...i was searching for days and i found someone from another forums suggested downgrading to 4.1.
I'm almost positive you need blobs.
 

iphone705

macrumors newbie
Jul 21, 2011
6
0
I'm almost positive you need blobs.
I did not use any shsh blobs. I bought the phone with 4.3.4 bb 5.16.02, and this my first jailbreak with 3gs... i had jailbroken 2 3g phones but that was weeks before i got the 3gs. They were under 4.2.1 firmware with 5.14. bb

I was researching for days and days. I thought i was going to give up on this phone since i cant use it. So now its downgraded to 4.1 and im able to unlock it with ultrasnow. Fully tested with legit AT&T sim and an international roaming sim.

Since i dont have SHSH blobs of previous firmware, i thought downgrade was impossible. But some people in gsm forums mentioned of downgrading to 4.1 so i gave it a try.
 

iphone705

macrumors newbie
Jul 21, 2011
6
0
now im thinking if its worth to upgrade to 4.3.3. Is there a big differece with 4.1 and 4.3.3?
 

awadeee

macrumors 68020
Jan 21, 2011
2,146
0
Canada
I did not use any shsh blobs. I bought the phone with 4.3.4 bb 5.16.02, and this my first jailbreak with 3gs... i had jailbroken 2 3g phones but that was weeks before i got the 3gs. They were under 4.2.1 firmware with 5.14. bb

I was researching for days and days. I thought i was going to give up on this phone since i cant use it. So now its downgraded to 4.1 and im able to unlock it with ultrasnow. Fully tested with legit AT&T sim and an international roaming sim.

Since i dont have SHSH blobs of previous firmware, i thought downgrade was impossible. But some people in gsm forums mentioned of downgrading to 4.1 so i gave it a try.
Neat. I'm assuming you installed the iPad baseband?
 

muski

macrumors newbie
Jul 24, 2008
14
0
Revert to 4.1 works!

iphone705 - thanks for this great tip. I was totally stuck without it.

I had a 3GS on 4.3.4 and 5.16.02 that I needed to unlock (and had no SHSH). I was able to downgrade it to 4.1 by a) doing the /etc/hosts trick (adding 74.208.105.171 gs.apple.com), and b) using iTunes. I manually selected iPhone2,1_4.1_8B117_Restore.ipsw (just needed activating afterwards). What was interesting was that before I downgraded I used Tiny Umbrella and it showed an SHSH file for my phone on 4.1 (and there's no way anyone had backed up this phone). So maybe it's some kind of generic SHSH? I don't know, but I'm sure happy about it!

Then I used redsn0w_mac_0.9.6b5 (only that version works) to jailbreak the OS and upgrade to the iPad baseband all in one go (used the same 4.1 IPSW file). (Note that you need to know whether you have the old or new bootloader, too.) Then I used ultrasn0w to unlock the SIM. All works now!

Don't think I'll back up to a jailbroken 4.3.4 now -- not clear that it will work yet. (reports of no signal).

BTW, my GPS works fine...
 

iphone705

macrumors newbie
Jul 21, 2011
6
0
thanks... i guess there's not way to unlock 4.3.4 at this time.
Don't think so... your only hope is the 4.1 downgrade. I have tried 4.3.3, 4.3.2, 4.0, 3.1.3. Apple is not signing them. But take note you will have to upgrade to bb 6.15 (ipad baseband) for ultrasnow to work if you have 5.14 and up bb.

Since 4.3.5 is out, i would see and try if 4.1 is still being signed. Last week i successfully downgraded another 4.3.4 but it had the deadly 1002 error so i had to sell the iphone for parts.

Just try this:
- click start, then run, type c:\windows\system32\drivers\etc\
- edit hosts file and remove any gs.apple.
- run itunes, shift restore, use 4.1 stock restore firmware.
- once it completes restore, jailbreak with redsn0w 0.9.6rc18 and use same 4.1 firrmware. install cydia and ipad baseband (Research first if you don't know its drawback).
- then install ultrasnow.

after its all done... save your shsh blobs!
 

iphone705

macrumors newbie
Jul 21, 2011
6
0
i just found out 4.1 firmware is open (doesnt required to be signed.) That's why i was able to install the firmware even without gs.apple in hosts file.
 

pjjanani

macrumors newbie
Jul 29, 2011
1
0
Pls help

Hi .. I am stuck in the exact same situation
I have a 3gs phone 4.3.4 version baseband 5.16.02
I actually without knowing just clicked on update when itunes asked me for it.
Now iam stuck and its not recognizing my SIM card.

I did read through the thread.
But could anyone explain me what needs to be done in detail. I couldnt understand the details.
How do I downgrade to 4.1 ?
and after downgrading do i have to again download the ipsw firmware file and again do a jailbreak and then do an unlock ?

I currently did a tethered jailbreak but the sim is still not recognized
And as u had mentioned i couldnt find a unlock for 4.3.4 anywhere ??
 

Abs_p

macrumors 6502a
Jul 15, 2011
888
396
i just found out 4.1 firmware is open (doesnt required to be signed.) That's why i was able to install the firmware even without gs.apple in hosts file.
True. It needs to be signed though ;) apple signs it .. All stuck on 4.3.4/5 downgrade to that. If you have shsh blobs well you can do whatever you want to !!
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.