3GS Jailbreak 4.0 Old Bootrom

[swinneyn]

I have a 3GS with a fresh restored copy of 4.0 on it. I'm on the old bootrom, but I've never jailbroke before. Is it possible to jailbreak? I've tried Pwnagetool 4.0.1 on mac but i just get the 1604 error message.

 

[Myzhi]

Nope. On 3GS, you can only get to JB OS 4.0 by restoring with a custom firmware while running JB OS 3.13 or below.

 

[joeflash]

what if you have 3.0 and an old bootrom? its been jailbroken before but now i cant seem to upgrade to 3.1

 

[thelatinist]

what if you have 3.0 and an old bootrom? its been jailbroken before but now i cant seem to upgrade to 3.1

You can jailbreak with redsn0w and then upgrade to a custom 4.0 firmware.

 

[Myzhi]

what if you have 3.0 and an old bootrom? its been jailbroken before but now i cant seem to upgrade to 3.1

Apple is only signing 4.0. Thus, you can officially only upgrade to that version.

2 ways to upgrade to different version:

1) Have your SHSH files saved for firmware version you want to upgrade to. Then, you can upgrade & downgrade to that version. Search or google for Cydia & SHSH if you don't know.

2) Your phone is currently JB. This will allow you to run unsigned code. Thus, you can create custom firmware and upgrade with them.

If you are on 3.0, use Redsnow to JB it. Then, you can use option #2.

 

[thelatinist]

2) Your phone is currently JB. This will allow you to run unsigned code. Thus, you can create custom firmware and upgrade with them.

A small correction -- your phone must not merely be jailbroken, but also pwned (that is, have a modified version of iBoot which will boot modified firmware files). The Spirit jailbreak, for instance, does not pwn the iPhone, and will not enable upgrades to custom firmwares.

 

[jonnysods]

This is the same boat I'm in. Got the old boot loader, but on iOS4. Those Dev Team guys do such an amazing job, especially since everything is free for us. I hope they have something up their sleeves, but I'm not going to hassle them about it.

Sure would like my phone to work! I got it from eBay. Should have asked about it first!

 

[Applejuiced]

I have a 3GS with a fresh restored copy of 4.0 on it. I'm on the old bootrom, but I've never jailbroke before. Is it possible to jailbreak? I've tried Pwnagetool 4.0.1 on mac but i just get the 1604 error message.

No option but to wait for the new jb.

 

[douflag]

A small correction -- your phone must not merely be jailbroken, but also pwned (that is, have a modified version of iBoot which will boot modified firmware files). The Spirit jailbreak, for instance, does not pwn the iPhone, and will not enable upgrades to custom firmwares.

Ahhh, that explains why phones with Spirit JB can't go to iOS 4 properly.