Apple Perserving warranty with Iphone 4g jailbreak

[abdudi]

So i got an iPhone 4g, the firmware is 4.2.1 and i would like to jailbreak and unlock it without losing my warranty and be able to upgrade to future firmwares, is there such a way?

 

[The Pi]

Jailbreaking voids the warranty, however, they can't tell if it's void or not if it's been restored within itunes. (which undos everything you've done to the device) so your warranty is still intact.

You'd also be able to go to the lastest firmware through that route too

 

[dib]

Just read any guide about booting the iPhone into recovery mode and using iTunes to install a new or old ipsw OS. The device will be restored to a state just like when you opened the box.

 

[Jamstruth]

You can't unlock without voiding the warranty. Sorry dude. The latest way it works is to restore an iPad baseband firmware which is irreversible and instantly detectable by Apple.

 

[dib]

The consensus from what I've read so far is that if you do a total restore from DFU there is no way to tell it apart from any other iPhone, essentially retaining your warranty.

 

[metamaster]

A restore affects the firmware of the device. The baseband is separate, like a firmware for its cellular radio. If you're unlocked (iPad's baseband, 06.15.00.), you're on a higher baseband than what your iPhone normally supports and it will remain unchanged if you restore/update/downgrade, since iTunes only touches the baseband when it gets updated. Since Apple never implemented downgrading, hackers found a way to save your SHSH blobs, so you can downgrade yourself. Apple obviously never implemented a way to downgrade the baseband either, and the hackers haven't came up with a way to do so (yet).
So if you upgraded your baseband, regardless if it is a normal version, there is no going back. That's why Tiny Umbrella and other jailbreak tools allow you to upgrade while preserving the baseband.

 

[Hatchetball]

GreenPois0n.

 

[Dialexio]

When you jailbreak your iPhone, its warranty is invalidated. But as previously mentioned, Apple won't know with the help of a DFU restore.

You can't unlock without voiding the warranty. Sorry dude. The latest way it works is to restore an iPad baseband firmware which is irreversible and instantly detectable by Apple.

A restore affects the firmware of the device. The baseband is separate, like a firmware for its cellular radio. If you're unlocked (iPad's baseband, 06.15.00.), you're on a higher baseband than what your iPhone normally supports and it will remain unchanged if you restore/update/downgrade, since iTunes only touches the baseband when it gets updated.
abdudi said they have an iPhone 4, which never had an unlock since 4.0.x. The iPhone 3 cannot use baseband 6.15.00, as it uses a different baseband chip from the original iPad, iPhone 3G, and iPhone 3GS.

QUOTE(metamaster @ Mar 15 2011, 07:20 PM)

Since Apple never implemented downgrading, hackers found a way to save your SHSH blobs, so you can downgrade yourself. Apple obviously never implemented a way to downgrade the baseband either, and the hackers haven't came up with a way to do so (yet).

Downgrading has always been possible with DFU Mode. Apple did try to stop downgrades by forcing SHSHs to be fetched from Apple's servers with newer device/firmware combinations.

It's actually possible to downgrade the iPhone 4 baseband, provided Apple's still issuing SHSHs for that firmware. (Or if you have an old iPhone 3G, a tool in Cydia can be used to downgrade it.)