[HELP] Erase iPhone 3G

[iTony34]

I have an iPhone 3G that is jailbroken and unlocked on 4.1.

How would I go about restoring the iPhone to 4.1 to factory settings without losing my 4.1 unlock and jailbreak?

A video from YouTube would also be helpful if you can't give me step by step directions.

Thanks in advance!

[iYeow]

PC : Use Snowbreeze 2.0.2 or 2.1 to create a custom fw of 4.1. Run redsn0w 0.9.6b6 and browse to stock fw of 4.1
Check the box : dfu mode and until it says DFU done.
Now run itunes : shift + restore to custom firmware of 4.1
When building the cfw, use expert mode and uncheck the activate my iphone. You will need the official sim to trigger it into home screen
Unlock with Ultrasn0w.

[iTony34]

Sorry I forgot to add that I use a MAC

[iYeow]

Then you Pwnage tools 4.1.2 to create a custom firmware of 4.1.
Once finished creating, you can use Pwnage tools to put you into dfu mode and restore to CFW of 4.1 thru itunes.

[iTony34]

The problem is, even when using the custom firmware, since it is an older firmware, it will say invalid version. Won't I need to use tinyumbrella and use my shsh?

[iYeow]

Yes, if only you have 4.1 shsh blob. If you are thinking of selling it, then you can restore to 3.1.3 without shsh blobs.

[iTony34]

I just bought this iPhone so I want to erase everything on it and still be unlocked so to restore to 4.1 from a jailbroken 4.1 3G, would I need to use tinyumbrella?

[iYeow]

Before you do any restore, use tiny umbrella, plug your iphone in and click save shsh. Let me know what shsh you have.

[iTony34]

I have the 4.1 shsh

Baseband version is 6.15.00 (iPad baseband?)

[iYeow]

Then you can restore to custom firmware of 4.1. You don't have to use tss server. Closing tiny umbrella will automatically set your hosts file pointing to Cydia.

[iTony34]

So to restore my 4.1 iPhone 3G on 06.15.00 baseband, all I have to do is use pwnagetool to make custom 4.1 firmware and restore? And I'll still be able to unlock with ultrasn0w?

[iYeow]

Since you have updated your bb, you can just shift + restore to stock fw of 4.1. You don't need custom firmware.

Once you have restored to stock 4.1, jailbreak with Redsn0w 0.9.6b6 and unlock with Ultrasn0w.

[iTony34]

I'm still confused. Since apple doesn't sign 4.1 anymore, I need to be running tinyumbrella right? To work with the cydia server?

[iYeow]

There are two ways, one is to use tss server and the other is to verify through Cydia server. By default, TU has set your hosts file towards Cydia.
All you need to do is Shift + restore.