Redsn0w 0.9.5 beta jailbreak ios 4.0

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Update 6/17/2010

The redsn0w beta has been updated for 4.0GM on iPhone 3G and iPod touch 2G (non-MC version). Multitasking and homescreen wallpaper are turned on by default (Apple doesn't normally allow this on these 2 devices). You can deselect these features if you choose.

A version for Windows is now provided.

Just like our other betas, this one intentionally doesn't “hactivate” the iPhone. Please wait for Apple's public release of 4.0 for that part of it.

YOU SHOULD STAY CLEAR OF THIS BETA SOFTWARE IF YOU RELY ON A CARRIER UNLOCK. That's because the beta redsn0w works only if your device has already been upgraded to the stock 4.0beta1/beta4/GM IPSW from Apple, which contains a baseband update. If you installed that IPSW, you've already lost the carrier unlock until the next planned release of ultrasn0w and blacksn0w.

What is it?

This is a beta release of redsn0w targeted at developers of jailbroken apps. It uses the same pwnage2 DFU-mode exploit that we've been using since the 2.x days. Nothing new is revealed to Apple, and it's not applicable to the iPad. Don't go near it if you use yellowsn0w, ultrasn0w, or blacksn0w.

Please note that this beta is not meant for the average end-user. There are many things “broken” with jailbroken apps in the 4.0 environment right now (that's the real reason we showed “Veency” in the 4.0 jailbreak demo video back on April 9, instead of say MobileTerminal.app, which is broken!). This beta redsn0w allows the developers behind those jailbroken apps (like MobileTerminal.app!) to fix their software before the general public gets iOS 4.0.

Because it's meant for JB app developers, this beta redsn0w does not perform hactivation. You'll need a properly-registered developer UDID with Apple to get past the activation screen. For similar reasons, there is no Windows version of this beta redsn0w (since apps are developed on MacOSX). Please don't pirate Apple software.

Anyone other than developers of jailbroken apps porting their software to 4.0 should still be using our previously-released redsn0ws for 3.0 through 3.1.3

What devices, platforms, and FW versions are supported?

This BETA release supports:

iPhone 3G and iPod touch 2G only (for now)
Mac OSX and Windows only (for now)
the 4.0beta1/beta4/GM FW only (for now)
YOU SHOULD STAY CLEAR OF THIS BETA SOFTWARE IF YOU RELY ON A CARRIER UNLOCK. That's because the beta redsn0w works only if your device has already been upgraded to the stock 4.0beta1/beta4/GM IPSW from Apple, which contains a baseband update. If you installed that IPSW, you've already lost the carrier unlock until the next planned release of ultrasn0w and blacksn0w.

How do I use it?

If you're a developer for jailbroken apps and you've already updated your device to 4.0, the next steps are:

Make sure you've already activated your iPhone3G with iTunes and your developer UDID
Launch the beta redsn0w 0.9.5b5
Select your stock 4.0 ipsw (you've already used this to update your device to 4.0)
Select “Install Cydia” and click “Next”. Use DFU mode to install the jailbreak.
When your iPhone3G comes back up, you'll notice Cydia has a blank white icon (we told you many things were broken right now!) Allow Cydia to reorganize, then accept the update it offers. When Cydia restarts, you should see its real logo now.
Help! I should have listened and just left this for JB app devs!

If you find that you want to back down from the 4.0 until it's more useable, here's how to do it.

Restore to official 3.1.2 or 3.1.3. Your baseband won't be downgraded, so you'll get error 1015 at the end of the restore.
Use rslite or irecovery to get past error 1015. Using rslite, you'd do:
% rslite
rslite v0.2 - by the iPhone Dev Team, 2009.
--THIS IS AN UNSUPPORTED TOOL--

Connecting...
[Recovery] setenv auto-boot true
[Recovery] saveenv
[Recovery] reboot
Your baseband will still be at 05.13 from 4.0, but FW 3.1.2 and 3.1.3 will work fine with it. The current carrier unlocks will not.

Feedback

Please send any feedback to MuscleNerd (either gmail or iphone-dev.org).