Apple has just announced iOS 4.1 final version for iPhone 4, 3GS, 3G and iPod Touch devices. iOS 4.1 will feature HDR(High Dynamic Range) photos, HD video uploads over Wifi and Game Center for end users. Moreover iOS 4.1 comes with a fix for bugs in proximity center, Bluetooth and iPhone 3G performance issues.

Previously we shared a method which allowed you to downgrade your iPhone and iPod Touch firmware from iOS 4.0.2 to iOS 4.0.1, however the procedure for downgrading was valid only for those devices who have already saved the SHSH blobs of iOS 4.0.1. Folks at PwnMyI Forums have managed to downgrade iOS 4.0.2 to iOS 4.0.1 on iPhone 4 and iPhone 3GS (New bootrom) even if you haven’t saved the SHSH blobs of iOS 4.0.1.

The famous multitasking app for iPhone and iPad has been released for iOS 4 based devices and is available for download via Cydia. Previously Multifl0w was compatible with iPhone 3G and iPhone 3GS running iPhone OS 3.1.x but now thanks to @aaronash who completely rewrote the code of Multifl0w to make it compatible with all jailbroken iPhones and iPads running iOS 4 and iOS 3.2.

You can jailbreak iOS 4.0.2 on iPhone 3GS (Old bootrom) with the unofficial build of PwnageTool. For those who don’t know, Apple released iOS 4.0.2 for iPhone 4, 3GS, 3G and iPod Touch 2G, 3G fixing the PDF exploit which enabled all iPhone, iPod Touch and iPad users to jailbreak their devices on all firmwares. If you are on iOS 4.0 / 4.0.1 or less, you can use this PDF patch to save your device from PDF vulnerability without updating firmware to iOS 4.0.2.

iH8sn0w [@iH8sn0w], the iPhone hacker behind famous tools like BlackBreeze, F0recast & Sn0wbreeze, has jailbreaked iOS 4.0.2 on iPhone 3GS (Old bootrom) with Sn0wbreeze v2.0 which is yet to be released. For those who don’t know, Sn0wbreeze is a PwngaeTool port on Windows OS which creates custom cooked IPSW file which can be easily restored through iTunes to jailbreak the device.

Apple has finally fixed the PDF exploit used by Comex in JailbreakMe by releasing iOS 4.0.2 for iPhone 4, 3GS, 3G and iPod Touch 2G & 3G. This update will not upgrade your baseband version but still upgrading your iPhone or iPod Touch to iOS 4.0.2 will leave your device in an unlocked state as there is no official tool available yet which can jailbreak and unlock devices running iOS 4.0.2.

iPhone Dev Team has released Ultrasn0w v1.1-1, an update to Ultrasn0w v1.0-1. iPhone Dev Team has tweaked few things which will ensure better battery life, performance and more stability on all iPhone 4 devices. Like the previous release, Ultrasn0w v1.1-1 can unlock iPhone 4 running iOS 4.0 / 4.0.1 with 01.59.00 baseband and iPhone 3G, 3GS with 04.26.08, 05.11.07, 05.12.01 or 05.13.04 baseband version.

As promised, iPhone Dev Team has released their much awaited version of Ultrasn0w (v1.0-1) which can unlock iPhone 4 running iOS 4.0 / 4.0.1 with 01.59.00 baseband and iPhone 3G, 3GS with 04.26.08, 05.11.07, 05.12.01 or 05.13.04 baseband version. Once you have jailbreaked your iPhone by using JailbreakMe, you can follow the step-by-step procedure below to unlock your iPhone 4, 3GS, 3G.

Apple has just released iOS 4.1 Beta 3 (build 8B5097D) and iOS SDK 4.1 Beta 3 (build 10M2308) for developers. This is probably the last beta release of iOS 4.1 before Apple will seed iOS 4.1 final version to all iPhone 4, 3GS, 3G and iPod Touch 2G, 3G users. If you have a registered Apple Developer Account, you can download iOS 4.1 Beta 3 and SDK by singing into iPhone Dev Center.

If you have jailbreaked iOS 4.0 or iOS 4.0.1 on your iPhone or iPod Touch then you might need to patch MobileInstallation file on your device which then allows you to install cracked apps on your device without iTunes. To patch the MobileInstallation file, you need AppSync which you can easily install on your jailbroken iDevice using the step-by-step guide below.