Jailbreak 4.2.1 with redsn0w 0.9.6b4

**Paul Daniel Ash** · 11-23-2010, 04:21 PM

MartiniBoy got out in front with this earlier today, but I just wanted to make sure the news was on the main page. The Dev-Team updated redsn0w to version 0.9.6b4 today, which, as Nick detailed yesterday, provides an untethered jailbreak of iOS 4.2.1 for iPhone 3G, older iPhone 3GS, and non-MC iPod touch 2G, and a tethered JB for the iPhone 3GS (new bootrom), iPhone 4, iPad, iPod touch 2G (MC model), iPod touch 3G and the iPod touch 4G. thanks to a combination of pwnage2 exploit, the arm7_go exploit, 24kpwn, and limera1n. For best results, upgrade to iTunes 10.1 first.

Again, it's very important to note that if you unlock, you cannot use redsn0w as it will update your baseband. So if you're an unlocker, or have a newer iDevice and would just prefer the security of an untethered JB, wait for the PwnageTool update before loading 4.2.1. Even if you are ready (like I was) to take the plunge, make sure you back up your SHSH first.

Source: Dev-Team Blog

**adrian1480** · 11-23-2010, 04:24 PM

yay Jailbreak!

I'll be waiting for the PwnageTool update, personally. Good luck to all who go with redsn0w!
Edit Poseidon:

For everyone with a newer device - iPad, iPhone 4, newer 3GS, New iPod Touch.

Red Redsnow first to install Cydia. Your device will finish the jailbreak process and Cydia will appear white and crash when you try and open it.

THEN run redsnow AGAIN and chose "Just boot tethered right now" which will run through the process again but this time Cydia will appear as normal and open up just fine.

Thank you to the post on the second or third page for pointing this out!

**big poops** · 11-23-2010, 04:24 PM

If I upgrade then jailbreak again do I have to download all my jailbreak apps/themes all over again? Or is there a way to preserve it??

**fluffybunnyabc** · 11-23-2010, 04:32 PM

Is cydia and sb settings and winterboard working now then?

**brianlg** · 11-23-2010, 04:35 PM

what are the specifics for "old 3GS" my i4 will be tethered, but my brother has a 3gs.

**ipodtouchman77** · 11-23-2010, 04:36 PM

Does this mean cydia works now?

**macfan406** · 11-23-2010, 04:44 PM

Is this gonna boot the os unjailbroken or lock into recovery mode?

**thazsar** · 11-23-2010, 04:47 PM

Originally Posted by big poops

If I upgrade then jailbreak again do I have to download all my jailbreak apps/themes all over again? Or is there a way to preserve it??

@big poops
Get PackageBackup from Cydia. It's paid but supposedly more reliable. AptBackup is free and 'might' work but I don't know if it requires a 4.2.x update. If nothing else, you'll have to reinstall ur App Store apps after restoring with AptBackup.

**Cowboy** · 11-23-2010, 04:48 PM

Remember this a teathered jailbreak so you will have to jailbreak everytime you have to reboot. You will lose your unlock if you do this jailbreak

**thazsar** · 11-23-2010, 04:48 PM

Originally Posted by brianlg

what are the specifics for "old 3GS" my i4 will be tethered, but my brother has a 3gs.

Old 3GS is untethered

**mrdjflood** · 11-23-2010, 04:48 PM

Originally Posted by big poops

If I upgrade then jailbreak again do I have to download all my jailbreak apps/themes all over again? Or is there a way to preserve it??

Search in Cydia PkgBackup...

**thazsar** · 11-23-2010, 04:49 PM

Originally Posted by macfan406

Is this gonna boot the os unjailbroken or lock into recovery mode?

This is a restore w/ custom FW. If u end up in Recovery Mode afterwards, RecBoot 'should' be able to get u out of it.

**brianlg** · 11-23-2010, 04:50 PM

Originally Posted by thazsar

Old 3GS is untethered

yes, i know. My question is how do you know if it's an "old 3GS" i know old bootrom probably, but how can you tell?

**gthugballin** · 11-23-2010, 04:51 PM

I jailbroke my iphone 4 this way last night, but cydia wouldn't open for me so i downgraded back to 4.1 anyone try this on iphone 4 with different results?

**exNavy** · 11-23-2010, 04:52 PM

Originally Posted by Paul Daniel Ash

you cannot use redsn0w as it will update your baseband.

No it doesn't.

Using itunes to install 4.2.1 firmware updates the baseband as part of the update/restore process.

It's an important distinction to make. Redsnow jailbreaks whatever is on your phone.

**tw1zt3d** · 11-23-2010, 04:53 PM

So i can finally update my 3G from 3.1.2 to 4.2? i have a handful of apps that no longer get transferred to the phone because they require 4.xx fw to work, i don't care about unlocking, but i do care about all the little tweaks i've done to the phone.

**iPhoenix3g** · 11-23-2010, 04:54 PM

Originally Posted by gthugballin

I jailbroke my iphone 4 this way last night, but cydia wouldn't open for me so i downgraded back to 4.1 anyone try this on iphone 4 with different results?

You didn't use beta 4, you must of used beta 3. I have used this with my iphone 4 and cydia has bin updated and works just fine now. A bit annoying you have to DFU your iPhone if you need to reboot.

**Poseidon79** · 11-23-2010, 04:55 PM

For whatever reason the jailbreak works fine on my 4.2.1 iPad but Cydia shows up white and crashes... wth.

**iPhoenix3g** · 11-23-2010, 04:55 PM

Originally Posted by tw1zt3d

So i can finally update my 3G from 3.1.2 to 4.2? i have a handful of apps that no longer get transferred to the phone because they require 4.xx fw to work, i don't care about unlocking, but i do care about all the little tweaks i've done to the phone.

I've heard from my friend with a 3g that 4.2.1 runs a little faster

**IphoneReaper** · 11-23-2010, 04:56 PM

As others have awed does this require cydia patch or not????

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