HOW TO: Jailbreak iOS 4.2.1 Untethered with Redsn0w 0.9.7b1

As [You must be registered and logged in to see this link.], the iPhone Dev Team has [You must be registered and logged in to see this link.] the necessary jailbreak tools which can untether the latest [You must be registered and logged in to see this link.] jailbreak on iPhone 4, iPod touch 4G, and iPad. Old-generation iOS devices already have untethered jailbreak on iOS 4.2.1.

For those who don't know, Apple has already [You must be registered and logged in to see this link.] the untethered patch in [You must be registered and logged in to see this link.]
update so it becomes tethered jailbreak on new-generation devices
mentioned above. Being tethered jailbroken means that once your iPhone
is successfully jailbroken, you'll need to connect your iPhone to your
computer if you ever need to reboot your iPhone or your iPhone loses
battery charge. The updates Redsn0w 0.9.7b1 brings untethered jailbreak
for those devices on iOS 4.2.1.

Below is the full step-by-step guide to jailbreak your iOS device using
Redsn0w 0.9.7b1 and get untethered jailbreak immediately.

STEP 1: First of all, you have to jailbreak your iOS 4.2.1 device using Redsn0w by following the step by step instructions [You must be registered and logged in to see this link.].

STEP 2: Once jailbroken, tap on Cydia and check if your 4.2b3
SHSH blobs saved or not. You should see "SHSH: 4.2b3" in the status as
shown in the screenshot below:

STEP 3: Now download Redsn0w 0.9.7b1 from the links given below and connect your iPhone, iPod touch or iPad.

STEP 4: Since this is a beta release, you must have usbmuxd that can be download from [You must be registered and logged in to see this link.]. Now start terminal in python-client directory then type in the following commands:

chmod +x tcprelay.py

./tcprelay.py -t 22:2222

STEP 5: Now start Redsn0w 0.9.7b1 and point it to the official iOS 4.2.1 .IPSW file.
STEP 6:
In the next page, check on Jailbreak Monte which untethers your iOS
4.2.1 jailbreak then point it to iOS 4.2 beta 3 firmware (Google it if
you don't have a developer account).
STEP 7: Final step is to put your iOS device in DFU Mode using Redsn0w instructions on the screen.

Finally, sit back and let Redsn0w go in bunch of steps and you'll
finally get untethered jailbreak on your new-generation iOS device.

Please note that this is a beta release, and upcoming versions will
bring support for Windows users and will have built-in usbmuxd for
easy process.

[You must be registered and logged in to see this link.] Redsn0w 0.9.7b1 for Mac OS X
[You must be registered and logged in to see this link.] iOS 4.2.1 for iPhone, iPad and iPod touch
[You must be registered and logged in to see this link.] iTunes 10.1.1 for Windows / Mac OS X