The iPhone Wiki - User contributions [en]

Talk:S5L8900

2010-06-12T13:45:02Z

RyanB:

Hi there just wondering if it should be

VROM->LLB->iBoot->Kernel->System Software

One of the iPhoneLinux goals are to replace that Boot Chain after iBoot:

VROM'''->LLB->'''OpeniBoot->Linux Kernel->X Server->Window Manager

rather than the current

VROM->LLB->iBoot->Kernel->System Software

One of the iPhoneLinux goals are to replace that Boot Chain after iBoot:

VROM->OpeniBoot->Linux Kernel->X Server->Window Manager

?

Talk:S5L8900

2010-06-12T13:44:29Z

RyanB: New page: Hi there just wondering if it should be VROM->LLB->iBoot->Kernel->System Software One of the iPhoneLinux goals are to replace that Boot Chain after iBoot: VROM'''->LLB->'''OpeniBoot->Linu...

Hi there just wondering if it should be

VROM->LLB->iBoot->Kernel->System Software
One of the iPhoneLinux goals are to replace that Boot Chain after iBoot:
VROM'''->LLB->'''OpeniBoot->Linux Kernel->X Server->Window Manager

rather than the current

VROM->LLB->iBoot->Kernel->System Software
One of the iPhoneLinux goals are to replace that Boot Chain after iBoot:
VROM->OpeniBoot->Linux Kernel->X Server->Window Manager

?

Spirit

2010-05-06T16:32:14Z

RyanB:

[http://www.spiritjb.com/ Spirit] is an [[untethered jailbreak]] by Comex (et al.) for Mac OS X and Windows that jailbreaks all iPhones/iPod touches and the iPad on firmware 3.1.2 through 3.2. Spirit also requires [[iTunes]] 9.0 or greater to be installed. It is a userland exploit, unique in that it does not rely on an [[iBoot]]/[[Bootrom]] exploit. Due to MobileBackup requiring activation to be used, Spirit requires [[activation]]. It appears to copy a dylib to the "var/mobile/Media/spirit" folder and adds a startup daemon that seemingly allows the jailbreak to work untethered.

==Exploits==
*[[MobileBackup Copy Exploit]]
*[[Incomplete Codesign Exploit]]
*[[BPF_STX Kernel Write Exploit]]

== See also ==
* [[Jailbreak_iPhone2,1_/_iPod3,1]]

==Notes==
* Windows may report error c0000005. Running Spirit in Compatibility Mode as Windows 98 will get around this.
* On May 3, 2010, an updated version has been released to fix some problems. One problem was that some pictures could get deleted.
* File size of the Windows exe is 4570608 bytes (both versions)

Jailbreak (S5L8920+)

2010-05-06T16:23:08Z

RyanB:

Apple did not have the time to fix the [[0x24000 Segment Overflow]] in the [[S5L8920 (Bootrom)|S5L8920]]. However, in order to flash an exploited [[LLB]] and jailbreak the [[N88ap|iPhone 3GS]], '''one''' of the following needs to be done:
* Find a new [[iBoot]] exploit every time a new firmware is out.
* Find a way to bypass the [[ECID]] checks.
* Find another bootrom exploit that allows unsigned code executing via USB ([[Pwnage 2.0]]-like)

This also applies to the [[N18ap|iPod touch 3G]] and later devices, except a bootrom exploit is needed.

==ECID==
Apple added a new tag to the [[IMG3 File Format]] called ECID. The ECID is ''unique'' to each phone, and is being sigchecked. So Apple could block downgrades once newer firmware becomes available, unless you have a dump of your unique old firmware's IMG3 or signed certificate. Therefore, iBoot exploits won't be so useful for tethered jailbreaks, because such exploits will be closed in new firmwares. [http://iphonejtag.blogspot.com/2009/06/ecid-field-downgrades-no-dice.html].

The issue with this is that, even with 24kpwn still in bootrom, an [[iBoot]] exploit is still needed to actually flash the exploited [[LLB]]. If Apple uses this ECID stuff to block downgrades, then a new [[iBoot]] exploit will be needed whenever they fix the last, so that [[24kpwn]] can be applied. This is because Apple could choose to not let you upload an older, exploitable [[iBEC]]/iBoot/[[iBSS]] to the device.

There are methods to help keep your downgrading ability, though.

* If it was cached prior to 3.1's release, 3GS owners can save a file which contains the signature of the 3.0 iBSS containing their [[ECID]], using [http://purplera1n.com/|purplera1n.com].
* Saurik's servers are actively caching the necessary files. [http://www.saurik.com/id/12#howto Instructions] to use the servers are included.
* The [[SHSH]] associated with an ECID can be also saved by running [http://thefirmwareumbrella.blogspot.com/ Umbrella]. An included application, TinyTSS, would allow the user to restore to whatever version is associated with that SHSH file permanently. This is based on the aforementioned service Saurik provides remotely from his server(s). The only difference is that Umbrella and TinyTSS are local applications.

==Jailbreak tools==
===Firmware 3.0 for iPhone 3GS===
There are several possible methods to jailbreak which use the same iBoot exploit discovered independently by [[User:Geohot|Geohot]] and the [[iPhone Dev Team]]:

* [[redsn0w]] 0.8 by the iPhone Dev Team (also works with 3.0.1)
* [[PwnageTool]] 3.0.1 by the iPhone Dev Team
* [[purplera1n]] by Geohot.

===Firmware 3.1 for iPhone 3GS===
Firmware 3.1 can be jailbroken using
* [[PwnageTool]] 3.1.3 (Mac only), provided that the device was previously jailbroken on 3.0/3.0.1.
* [[Blackra1n]] by Geohot

===Firmware 3.1.2 for iPhone 3GS===
Firmware 3.1.2 for iPhone 3GS can be jailbroken using
* [[PwnageTool]] 3.1.4 (Mac only).
* [[Blackra1n]] by Geohot

===Firmware 3.1.1/3.1.2 for iPod Touch 3G===
It is currently possible to jailbreak all devices that ship with 3.1 pre-installed or that have updated to 3.1/3.1.1/3.1.2 using [http://www.blackra1n.com geohot's blackra1n].

===Firmware 3.1.3/3.1.2 for iPhone 3GS and iPod Touch 3G===
Firmware 3.1.3 for iPhone 3GS (Both bootroms) and iPod Touch 3G can be jailbroken using
* [[Spirit]] by Comex.

Jailbreak (S5L8920+)

2010-05-06T16:20:22Z

RyanB:

Apple did not have the time to fix the [[0x24000 Segment Overflow]] in the [[S5L8920 (Bootrom)|S5L8920]]. However, in order to flash an exploited [[LLB]] and jailbreak the [[N88ap|iPhone 3GS]], '''one''' of the following needs to be done:
* Find a new [[iBoot]] exploit every time a new firmware is out.
* Find a way to bypass the [[ECID]] checks.
* Find another bootrom exploit that allows unsigned code executing via USB ([[Pwnage 2.0]]-like)

This also applies to the [[N18ap|iPod touch 3G]] and later devices, except a bootrom exploit is needed.

==ECID==
Apple added a new tag to the [[IMG3 File Format]] called ECID. The ECID is ''unique'' to each phone, and is being sigchecked. So Apple could block downgrades once newer firmware becomes available, unless you have a dump of your unique old firmware's IMG3 or signed certificate. Therefore, iBoot exploits won't be so useful for tethered jailbreaks, because such exploits will be closed in new firmwares. [http://iphonejtag.blogspot.com/2009/06/ecid-field-downgrades-no-dice.html].

The issue with this is that, even with 24kpwn still in bootrom, an [[iBoot]] exploit is still needed to actually flash the exploited [[LLB]]. If Apple uses this ECID stuff to block downgrades, then a new [[iBoot]] exploit will be needed whenever they fix the last, so that [[24kpwn]] can be applied. This is because Apple could choose to not let you upload an older, exploitable [[iBEC]]/iBoot/[[iBSS]] to the device.

There are methods to help keep your downgrading ability, though.

* If it was cached prior to 3.1's release, 3GS owners can save a file which contains the signature of the 3.0 iBSS containing their [[ECID]], using [http://purplera1n.com/|purplera1n.com].
* Saurik's servers are actively caching the necessary files. [http://www.saurik.com/id/12#howto Instructions] to use the servers are included.
* The [[SHSH]] associated with an ECID can be also saved by running [http://thefirmwareumbrella.blogspot.com/ Umbrella]. An included application, TinyTSS, would allow the user to restore to whatever version is associated with that SHSH file permanently. This is based on the aforementioned service Saurik provides remotely from his server(s). The only difference is that Umbrella and TinyTSS are local applications.

==Jailbreak tools==
===Firmware 3.0 for iPhone 3GS===
There are several possible methods to jailbreak which use the same iBoot exploit discovered independently by [[User:Geohot|Geohot]] and the [[iPhone Dev Team]]:

* [[redsn0w]] 0.8 by the iPhone Dev Team (also works with 3.0.1)
* [[PwnageTool]] 3.0.1 by the iPhone Dev Team
* [[purplera1n]] by Geohot.

===Firmware 3.1 for iPhone 3GS===
Firmware 3.1 can be jailbroken using
* [[PwnageTool]] 3.1.3 (Mac only), provided that the device was previously jailbroken on 3.0/3.0.1.
* [[Blackra1n]] by Geohot

===Firmware 3.1.2 for iPhone 3GS===
Firmware 3.1.2 for iPhone 3GS can be jailbroken using
* [[PwnageTool]] 3.1.4 (Mac only).
* [[Blackra1n]] by Geohot

===Firmware 3.1.1/3.1.2 for iPod Touch 3G===
It is currently possible to jailbreak all devices that ship with 3.1 pre-installed or that have updated to 3.1/3.1.1/3.1.2 using [http://www.blackra1n.com geohot's blackra1n].

===Firmware 3.1.3 for iPhone 3GS and iPod Touch 3G===
Firmware 3.1.3 for iPhone 3GS and iPod Touch 3G can be jailbroken using
* [[Spirit]] by Comex.