How to Jailbreak Your iPhone 4 Using RedSn0w (Mac) [4.2.1]
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gooooooood thx

I have an iphone 4 version 4.2.1(8C148) with firmware 03.10.01, all I want to do is Jailbreak it and not unlock it because I have AT&T. on other comments I've seen that this updates the baseband... will this void my factory warranty and applecare? thanks!!

我基帶降不了

Hi, i just jailbroken my iphone 4. the cydia is installed, but its white app. not brown as it should be. when i click on it the cydia does not open nor safari. can anyone help me. i have macbook, mac os x leopard.

I did the steps to jaibreak and cydia works fine when tethered, but Safari does not work??? opens and closes right away.

Wow! Great tikhning! JK

Hi. Thanks guys, I am having a problem with jailbreak my iPhone4, I got my iphone a couple of days beforre officially on 4.2.1, tried so many times jailbreak it with redsnow but no success. what happens? after this procedure my iPhone4 reboots then everything is well, Cydia is white icon and when i press on it nothing happens. Any respond and idea will be nice and appreciated. regards

i Jailbroke my iphone 4 [version 4.2.1(8C148), firmware 03.10.01] using the latest Redsn0w mac 0.9.7b5 but having problem with Skype not loading. I tried the jailbreak process again to see if I was not doing it right but all apps seems to working fine except Skype and Watsapp. Just wanted to inform the dev team about the glitch. Thanksks for all the great work.

ive tried downloading the restore software but it shows it will take several hours to download - why is this? is there a different link i can use? thanks!

Thanks so much Dev-Team will contribute more and loads of love thanks guys for the hard work

Hi.. I've got an unlock iphone and it was already running 4.2.1 without JB. I tried to JB with redsn0w and followed all the steps in the tutorial, but when the iphone is doing its first reboot while in the process, it freezes.. I reboot it manually and start it back.. and i use the redsn0w app so that the phone start.. but when he starts, i don't have any network carrier :( and i can't even do a restore via iTunes, cause it says that my device isn't compatible.. how can i solve this out ? thanks!

Hey Guys, I have an iphone 4 i did jb but when i put the ship to another company it doesnt work. so, i still cant use my iphone with different company provider. Could u guys please help me out? Tks Arturo

thank you iPhone Dev-Team! it's works for me. i jb with iphone4 running 4.2.1 firmware.

Hoe did u get passes the network problem?

Hello Iclarified team Thank you for your support. I got it, with jailbreak was OK. Next question , how i can unlock my phone ? sorry for my disturb by the way my baseband before upgrade was 01.59 and now 03.10.01 it's ok or no ?

Hello need your help. jailbreak 4.2.1 also unlock as well. redsn0w wrote that unable recognize specified IPSW what's wrong ?

Is there available jailbreak for iPhone4 with IOS 4.2.1 on OS Tiger 10.4.11? I downloaded the Redsnow jailbreak for iPhone4 IOS4.2.1 but when I double click it it say " it is not supported in this architecture?." Thanks.

All steps followed but I keep getting stuck at reboot. Can anyone please help?

all, I think the first step is that you need to upgrade the OS to 4.2.1 completely. Then, you can follow this procedure to JB your iphone 4. Otherwise, it might not work. This is my experience for sharing.

I just got an iPhone 4 on Mon and had a problem with the JB. I used Pwnage to JB my 3G with no problem, but can't get past Step 2 here for Redsn0w. Exact Message is: The iPhone "NAME REMOVED" could not be restored because the firmware file is not compatible" with the options of [More Information] or [OK]. Anyone know the remedy for this? I'd really like to fix this.

I did use Firefox. I am running OS X 10.6.4 Snow Leopard and thus do not have IE. I will try again, however, the only real need I have for JB is SBSettings so I can easily toggle brightness, Wi-Fi and Bluetooth and I guess if I ever need to unlock(even though there isn't one currently available for iPhone 4 firmware on 4.2.1).

this is the same problem i'm having. I guess i'll wait for another JB and try later.

use safari .it will work fine

Hello...!!! i jail broke my iphone and i made a cydia on my iphone 4, but when i rebooted it, cydia didnt work anymore! :( ( i tried to do that about 5 times!!! ) . . . Any Help?!?!?!?!?!?!

jailbreak is gone ok, but i don't have any network more(i can't make a call etc.) Does someone has the solutions for this?

Ok, you don't know the answer

This will lock your phone. It will update your baseband to the most recent, so don't do it if you need to unlock iy.

my iphone will not cut on after i installed cynia and jail broke it. any suggestions?

Hi I'm obviously doing something wrong. 1st time jailbreaker here on 4.2.1 iphone 4. When I select the isw file, itunes tells me it isn't compatible. What gives?

I just got an iPhone 4 today and had the same issue. I used Pwnage to JB my 3G with no problem, but can't get past Step 2 here for Redsn0w. Exact Message is: The iPhone "NAME REMOVED" could not be restored because the firmware file is not compatible" with the options of [More Information] or [OK]. Anyone know the remedy for this? I'd really like to fix this.

Everything done as said, but stuck at rebooting...doesn't boot up..any suggestions or ideas?

Mine will not reboot either, please help

mines wont re-boot either!!!! :( any ideas?? I followed all the instructions... everything runs smoothly until this... it was on this screen for over 10 minutes and won't reboot!

I'm stuck in the installation Activation Bundles.. doing nothing... Any suggestions

Same problem, please help

this wont workt at my iphone 4 its just stopps at step eleven any help???

I have the same problem, keeps stopping at reboot

I was able to Install new firmware. When I try opening Cydia it just shuts down... Anyone have this same problem?

now plug it again and with redsnow choose the option that says just booth tethered or something like that, it should work

same here, any ideas ???

Got the same problem, i can install Cydia but it appears as a white icon on y SpringBoard and everytime i try tu launch it it just crashes

Does this work for iPad too?!

too bad it's tethered for iPhone 4, but hey! thank you very much for this great job!!! :D

cool story bro

how about you come up with your own jailbreak then and leave this site...we dont need losers like you here

I have an unlocked iPhone from Apple Store Switzerland. Everytime when I update it doesnt lock. Can I update to 4.2.1 and Jailbreak it as mentioned above?

OK I SEE A JAIL BREAK IS OUT FOR 3G 4.2.1 BUT ITS ONLY FOR MAC DOES ANYONE KNOW WHEN A WINDOWS VERSION WILL BE OUT PLEASE REPLY ILL BE SOOOO HAPPY THATS GUYS

So obviously this method requires you to tether your iPhone 4 to boot it up.... But what about just re-springing? If I'm out and I re-spring my device will it take me back to the OS or do I have to wait until I can get to a computer to tether it? Thanks!

You have to wait to get back to comp.