After releasing iOS 4.2.1, the dev-team updated redsn0w to version 0.9.6b4 to jailbreak iPhone 4, 3GS, 3G, iPod touch 4G, 3G, 2G and iPad, I received many comments complaining about white Cydia icon and Safari crashing after jailbreaking their devices.

Therefore, dev-team has sent a new blog post update while the concept of a “tethered” jailbreak is pretty new to many people, let's check out this:

The notion of a “tethered” jailbreak is pretty new to many people, so here’s a quick rundown on what to expect:

1. If you’re on an iPhone3G, old-bootrom iPhone3GS, or non-MC ipt2g, life is easy. redsn0w installed an untethered jailbreak and so nothing below applies.
2. “Tethered” does not mean you cannot boot at all without PC/Mac assistance. If you have not installed any tweaks that hook into important programs like SpringBoard or CommCenter, your device will actually boot. However, jailbreak programs like Cydia won’t work (and Cydia may still have a white icon). Also, certain built-in apps that had to be moved by Cydia will fail (Safari being the most noticeable example).
3. If you’ve installed MobileSubstrate tweaks that hook into SpringBoard or other important programs, your boot will actually fail (you’ll get stuck at the Apple logo). You need to use redsn0w to “Just boot tethered right now”.

Remember, @comex and others are working on a way to untether the 4.2.1 jailbreak. Meanwhile, the above 3 points hopefully will make it all seem less confusing :)

You can avoid the reasons above to enjoy a jailbreak free of bugs (i.e. White Cydia Icon and/or Safari Crashing), but I highly recommend to wait for the comex untethered jailbreak on 4.2.1 which expected to be very professional (still no ETA). Let me know if you still facing these bugs or not via the comment section, stay tuned.

You may also like:

• HOW TO: Jailbreak iOS 4.2.1 iPhone 4, 3gs, 3g, iPad, iPodTouch with Redsn0w 0.9.6b4
• [WARNING] Apple Has Put a Baseband Requirement on iOS 4.2.1
• iOS 4.3 to Launch in December 13?

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