iPhone Dev Team has just released redsn0w 0.9.6 b4 with an official support for iOS 4.2.1 final release. It has fixed some issues with Mobile substrate and comex’s patches. They had promised an update yesterday as stated
So when does all this 4.2.1 jailbreak action happen? Well if you’re a JB developer or tinkerer, you’ve already probably used the redsn0w mentioned in our last post to jailbreak 4.2.1 and at least get SSH working. But beyond that, there are still some last minute issues with MobileSubstrate and comex’s kernel patches that are being fixed. We’ll tweet and post a blog update when it’s all available (we hate to give ETAs, but barring any unforeseen problems, probably later today).
For details, you can check earlier update about iOS 4.2.1 Jailbreak and unlock.
Supported Devices for Untethered Jailbreak:
- iPhone 3GS Old Bootrom
- iPhone 3G
- iPod Touch 2G Non MC Models
Supported Devices for Tethered Jailbreak:
- iPhone 4
- iPhone 3GS New Bootrom
- iPad
- iPod Touch 4G
- iPod Touch 3G
- iPod Touch 2G MC Models
Download redsn0w 0.9.6 b4 for Windows [Official Link] [Mirror Link]
Download redsn0w 0.9.6 b4 for MAC [Official Link] [Mirror Link]

{ 21 comments… read them below or add one }
Hmm, I think you were the first one to break the news
Download Redsn0w b4
when I try to jailbreak my ipod touch 2G 4.2.1 on my computer, it reboots it without a problem a few times and when it starts uploading the ramdisk a window suddenly pops up saying that Redsnow has stopped working and must close…heellpp?…
dude change the compatibility to windows xp service pack 3 ..check in properties
manstab.. = nice post… thank's a lot
lies!!!! you guys said it supports ipod 2g mc model and i downloaded it but when it recognizes the ipsw it asks if its a mc model and i said yes and it said srri we dont support that yet stay tuned >.<
same here tried 3 times
what should i do when i have an ipod touch 2g mc model?
Use Greenpois0n RC6
“Devices for TETHERED Jailbreak”
worked for me – its just a pain in the ass each time
says it doesnt work with ipod 2g MC model.
I have a problem with this one, i upgrade my iphone 3G to 4.2.1 and then go in the redsn0w , i had some trouble to get my iPhone into DFU mode, suddenly the jailbreak start, it goes very fast in the first stage, them it goes to second stage, and the it says wait for reboot and nothing happend.
My iPhone is not responding, is just black screen, i cannot do anything, neither DFU mode or turn on, nothing, any suggestions? Please help, i am in China and i really need to jailbreak my phone!
wireless connection is not working.. when i key in my key it freazesssss….help
the link says not found):
you can click mirror link that one works
when I try to jailbreak my ipod touch 2G 4.2.1 on my computer, it reboots it without a problem a few times and when it starts uploading the ramdisk a window suddenly pops up saying that Redsnow has stopped working and must close…heellpp?
Try holding the sleep button for at least 20 seconds, that helped me, and I didn't know why it went black.. if that doesn't help, try plugging it in to your outlet charger and holding the sleep button. -PANCAKEPVT
Whats up with it saying no mc model supported post something thats true!!!
so has this worked for anyone with a 3g?
Well I'm prtty sure it works with iPod Touch 2nd Generation, but I don't want to mess up my cell phone to find out it doesn't work.
hey aaron, it does work with a 3g
hey it's not work ~~! my ipod said error
where do i download the ispw file?