you want to jailbreak again on the same firmware
How to:
Plug in the device
Open up iTunes
Hold Shift and then click on restore
Then browse for the ipsw (the firmware) and then restore
yes. the current update is 3.1.3 and to update to it you have to restore you iphone, update it then re-jailbreak it. but at this moment in time this is not an jailbreak for firmware 3.1.3.
Us Jailbreak me on the iPhone 4 if you have the firmware 4.0
No. Linux cannot overwrite iPhone's firmware, as it is encrypted. Only iTunes can do that.
No. If you are running 3.1.3 (the latest firmware) on any iPhone, then you can jailbreak without unlocking. If you are on a firmware below 3.0, I think you can jailbreak without unlocking. I would like to add that I am pretty sure jailbreaking an iPhone is illegal because of your contract with Apple. Find me on YouTube: TheJailbreakGenius
No, I jailbroke my iPod touch with blackra1n, and I didnt have to restore it.
Upgrading an iPhone will update the firmware (the iOS) and will therefore remove the jailbreak. If you wish to stay jailbroken, it is highly recommended to not update until news of a new jailbreak arrives for the upgrade.
Here's a guide on how to jailbreak your iPhone iPod or iPad ios 4.2.1 and all previous models: http://reviews.ebay.com/How-to-Jailbreak-Your-iPhone-4G-iTouch-or-iPad-4-2-1_W0QQugidZ10000000020131595 I followed the step by step instructions and jailbroke my iPhone within minutes!
Plug it in to iTunes, press Restore. It should restore your iPhone to its factory settings, thus killing the jailbreak.
redsnow which you will need to jailbreak its the easiest way to do it and its free
Use Blackra1n to jailbreak your iphone, then use bootneuter in cydia to unlock iphone to any service. PS: downgrade firmware to 3.1.2. before running Blackra1n.
Depending on which OS or firmware your jailbreaking tool does but here is a Jailbreak i recommendMake sure you have your official sim which camewith the iPhone originallybecause when you upgrade or update to iPhone OS 4 --- 4.0.1 your iPhone has to be activated in order to jailbreak from your device directlyInstructions:Step 1. Update to 4.0.1 or download firmware belowiPhone 3gs 4.0.1:http://appldnld.apple.com/iPhone4/061-8618.20100715.Zapn4/iPhone2,1_4.0.1_8A306_Restore.ipswiPhone 3g 4.0.1: http://appldnld.apple.com/iPhone4/061-8616.20100715.phnt4/iPhone1,2_4.0.1_8A306_Restore.ipswiPhone 4 4.0.1:http://appldnld.apple.com/iPhone4/061-8619.20100715.4Pnsx/iPhone3,1_4.0.1_8A306_Restore.ipswStep 2. Then restore your deviceStep 3. After, on your idevice (your iPhone) open up safariStep 4. On the address bar enter www.jailbreakme.comStep 5. Read info, Then slide to jailbreak
back up all your junk on itunes then restore and put all your junk back on. POOF jailbreak gone