I had been wanting to jailbreak my iPhone 4 for quite awhile but since I had upgraded to Apple iOS release 4.2.1 there was not an untethered jailbreak available at the time and since I typically turn my iPhone completely off I didn’t want to deal with the untethered jailbreak. So needless to say when GreenPois0n rc5 was released I was pretty excited. GreenPois0n rc5 made it extremely easy to jailbreak iPhone’s running iOS 4.2.1. After running it for around a month now though I noticed that I really don’t install enough applications outside of what is available via the iTunes App Store to warrant the jailbreak and especially because I have personally noticed that with my iPhone jailbroken it had slowed down a bit. Not only had it slowed down but my battery appeared to be draining much quicker which I assume was from more processes running. I made the decision a couple days ago to roll back to the stock iPhone 4.2.1 firmware to see if my phone started running more efficiently. Below are instructions for rolling back the GreenPois0n firmware on an iPhone 4 to the Apple iOS 4.2.1 firmware release.
A friend had me jailbreak their iPhone 3G the other day and once that was completed he later asked if I could install Installous as well. Installous is an application on a jailbroken iDevice that will allow you to search and install applications similar to the Apple iTunes store. Follow the directions below to install Installous from within the Cydia application.
If you have a jailbroken iPhone or iPod Touch you may come across custom applications that you would like to install via iTunes so all of your applications are still managed in one place. I originally thought that I would just be able to drag the applications directly into iTunes, sync my iPod Touch with iTunes, and begin using my new application. I believe this used to be the case before iPhone OS 3.0 was released which is the version of firmware installed on my Touch. Anyhow I attempted to proceed by following the below steps and ran into an error also noted below.
Once you jailbreak your iPhone or iPod Touch there are tons of benefits available to you in the form of innovative applications that are not locked down by Apple. One of my iPod Touch’s is pretty beat up and no longer under warranty so I use it to test all sorts of things including being the first device I ever installed Cydia and Icy on. Anyhow the Touch device actually has a semi busted LCD screen, a broken power button, and a broken home button. On a iPhone running default firmware you would be pretty much out of luck if the home button or power button was not working but once the device is jailbroken then you can get around all of these issues easily.