redsn0w Beta 4b3 para MacOX

Over the Christmas weekend we’ll be releasing a version of redsn0w that implements the “backup plan” to the 4.2.1 untethered jailbreak.  We’re seeking your help to test this redsn0w and find any bugs before we do a general release!
(If you have an iPhone 3G, or an old-bootrom ipt2g or iPhone 3GS, you already have an untethered jailbreak!  Just use the latest public redsn0w.)
To keep things manageable, this will be a Mac-only test program.  We also request that any volunteers *NOT* need the ultrasn0w unlock (in case things go very wrong).
Right now, the “backup plan” requires that you have the 4.2b3 IPSW on your Mac, and that Cydia has your 4.2b3 SHSH hashes.  Please don’t pirate that 4.2b3 IPSW!  (We’re also working on a way that this technique might apply to all those with 4.1 IPSWs, but that’s not the first goal right now.)
If you fit all the above qualifications, please follow @redsn0w_testers on twitter for announcements, and use the comments section here for feedback.  Thanks very much for your help, and Happy Holidays!

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Update #1: We’re about to release the first beta using this new “backup method”, which redsn0w calls “Jailbreak Monte”.  Here are some important points:

• This is a beta tester program. It’s not a general release!  Things can go very wrong, so please don’t even consider testing if you have pictures or other media on your device that you haven’t backed up!
• For the same reason, please don’t participate if you rely on the ultrasn0w carrier unlock.  Wait for the final version!
• Until we fix some sandbox issues with bluetooth, the bluetooth functionality is disabled.
• This very first beta1 is limited to iPhone4, iPad, and iPod touch 4G.
• Cydia must have your 4.2b3 SHSH blobs saved on file.  (As we approach a general release, we’ll provide a way to let you use locally saved hashes too).
• You must already have the usbmuxd software installed and running on your Mac (this requirement will eventually go away too). The correct invocation of the relay is just as that page says: “./tcprelay.py -t 22:2222”.  If the relay isn’t installed or running correctly by the time the redsn0w ramdisk has started, you’ll need to restore to stock FW again to try it again.  Please test it beforehand to save yourself some time!
• Please leave all feedback in the comments below (we really need your feedback to help develop it into a stable release!)

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Update #2:  The second beta is now available (testers ONLY please!).  This version should fix all the native app crashes (including Task switcher).  That’s the only change in from beta1….Bluetooth is still disabled.

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Update #3:  The third beta is now available (testers ONLY please!).  This version extends the fix made in beta2 over to the non-GUI programs too (like the daemons that handle media content).  That should cover things like Facetime, Winterboard themes, and embedded videos in iTunes.  If you had trouble using the usbmuxd in previous betas, please wait until we incorporate that into redsn0w itself (i.e. don’t bother trying this beta3, just wait for the integration).

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Update #4: The fourth beta is now available (testers ONLY please!). Starting with this version, redsn0w no longer requires you to install and run a separate program for the usbmux (this was a non-trivial procedure for many).   It’s okay to keep that program running if you normally use it for ssh anyway.  We also think we’ve fixed a race condition in the GUI that was causing redsn0w to crash during the “Preparing JB Monte Files” step. Nothing at all has changed on the iPhone side (where the main issues are still just Bluetooth and Skype).
The download link is:

• redsn0w_0.9.7b4 (OS X).  If your device is currently jailbroken with one of the previous betas, please do a fresh restore first.  

Thanks to everyone who’s helped us test so far!  We believe this is the last big code change.  If beta4 goes smoothly, we can move on to opening up to Windows testers, the remaining devices, and fixing the Bluetooth and Skype issues.