redsn0w iOS 4.2.1 untethered Jailbreak "backup plan" released to beta testers [updated]

The iOS 4.2.1 untethered Jailbreak via redsn0w beta we posted about the other day is now good to go for testers. Again, this is not an untethered Jailbreak release it's just a beta that's buggy but, with testers' help and feedback, should get better and quick. Quoth the Dev Team:

  • 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: “./ -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!)

If the above scares or confuses you, stay away. If it excites and entices you, go grab the redsn0w beta test release via the link below, and let us know how it works for you!

Update: Please use extreme caution when using betas of anything. This is no exception. It seems the beta of redsn0w is causing a lot of users some serious grief. Us here at TiPb recommend staying on iOS 4.1 if you can or sticking with the tethered version for now. Here's a list of issues many users have been experiencing with the beta -

  • Bluetooth is disabled
  • iPod player not working on iPhone 4 and iPad
  • Application switcher causing the springboard to crash
  • YouTube is not working for many
  • Videos in your camera roll may not play at all
  • AirPlay not compatible
  • Some app store apps are crashing or not working at all

The above issues are pretty serious and exactly why the Dev Team has advised that general users stay away from this beta. It's for testers, not the general public. So unless you are using it for testing purposes, it's best to stay away. If you expect a fully functional jailbreak with no issues, this isn't it.

[iPhone Dev-Team]

Have something to say about this story? Leave a comment! Need help with something else? Ask in our forums!

Rene Ritchie

EiC of iMore, EP of Mobile Nations, Apple analyst, co-host of Debug, Iterate, Vector, Review, and MacBreak Weekly podcasts. Cook, grappler, photon wrangler. Follow him on Twitter and Google+.

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Reader comments

redsn0w iOS 4.2.1 untethered Jailbreak "backup plan" released to beta testers [updated]


Please use caution with this as it is causing users many issues. I'm personally sticking with the tethered version until a proper untethered version comes along.

Some of the issues are:
-Bluetooth is disabled
-iPod player doesn’t work on the iPhone 4 or the iPad
-Application Switcher will crash your iPhone
-YouTube won’t work
-Videos from the camera roll won’t play
-AirPlay won’t work
-Some App Store apps not working

Well the jailbreak is of course gonna have problems. It is just the beta testing so they can fix all the bugs and have a finished jailbreak for the public.

So when this is all fixed up and out of beta, what does one do to go from a tethered jailbreak to an untethered jailbreak? I just got an iPad for christmas, updated it to 4.2.1, JB it with redsn0w tethered and didn't even think about how it would work after the untethered became available.

Even safari is crashing now & then . Also frash is not working like it use too & not able to use Bluetooth & Airplay. I Am going Back To 4.1

@Daniel Torres
Are you aware that this is a beta release? Such is the nature of the beast; all stable releases are preceded by an arduous but exciting "buggy" phase. Using precedent as a basis, I assure you that the final release of this jailbreak will not present such seemingly catastrophic incompatibilities. That said - and considering your initial reaction - perhaps it is best that you not attempt to modify any mobile operating system at all, be it Android or iOS. Doing so without a firm grasp of either the jargon or the implications could be disastrous.

@ Bryan +1 lol!
As for the exciting news, I cannot wait for the final release of this! I'm new to iPhone, got my iPhone 4 just over a month ago, updated to iOS 4.2.1 immediately after getting iTunes running - sadly.
For some reason, jailbreaking sounds a bit petrifying but with all the work that's going into this release I'm sure I'll be ready to make the jump soon!
Keep up the great work folks!

So, it never came true the unthetered jailbreak huh? Apple wins this battle. If I want to use my iPad in its full capacity I need to forget about iOS 4.2.1 then.