Downgrade 3g

[onlinegamesnz]

So my old man has a 3g and i installed and jb'ed 4.01. Appears the 3g just wont accept ios4 cus its super slow. So what are ny chances of downgrading to 3.1.3?

[eyeRobot]

Download tinybrella and check out if you have SHSH saved for 3.1.x

4.1 is supposed to be fixed for speed on 3G and you JB it for 3G.

SCRATCH MESSAGE ABOVE!

You won't need SHSH for restoring to 3.1.2 or 3.1.3. Put the phone in DFU mode and do a shift restore to 3.1.2 you'll get an error message - use Tiny Umbrella to kick it out of recovery.

Once there, jailbreak with blackrain or redsnow (probably blackrain is quickest).

Now you can use custom firmware (create it with snowbreeze 2.0.2) to go to 4.1 and then simply unlock with ultrasnow.

[onlinegamesnz]

I dont think i saved the ssh. And its soo slow. He cant even receive calls it doesnt ring its that slow

[eyeRobot]

See above, got myself mixed up initially. I would suggest he goes to 4.1, but 3.1.3 is possible too.

[onlinegamesnz]

4.1 isnt jailbreakable right. Also would it be faster?

[eyeRobot]

OK, I've clearly confused you. Let me start again.

For downgrades to 3.x firmwares you don't need SHSH files to downgrade. So you could just downgrade and get him back to where he was before, no issues.

Apple addressed the slow performance of iOS4 on 3G handsets with firmware 4.1, so it's going to be comparable to what it was like on 3.1.3

You can get to 4.1 a couple of ways, but snowbreeze 2.0.2 is going to be fine.

Look at this link: http://www.redmondpie.com/jailbreak-...irmware-guide/

You will need to downgrade back to 3.1.x then jailbreak before using custom firmware to get him to 4.1

Clearer?

[i.Annie]

From where you are, create a custom fw for 4.1 with Sn0wbreeze. Then shift+restore to it. Simple and done

If you run into any errors durin the restore, run iReb to bypass and you should be fine.

[onlinegamesnz]

Ok thanks. So 3.x.x firmwares are no problem. Just shift+restore and shouldnt be a problem. But to get him to 4.1 i must create a custom firmware with snowbreeze. This sounds really hard. Also will 4.1 be faster? Is it optimized for the 3g?

Cheers again
Be patient with me

[i.Annie]

You're correct. You'll find it's very easy once you try doing it. 4.1 fixes the lag on 3G phone with iOS 4.0.x.

[onlinegamesnz]

So i still need to download the 4.1 3g firmware file correct?

[i.Annie]

Yes you'll need the stock 4.1 ipsw to build your custom fw.

[onlinegamesnz]

Just created a custom 4.1 firmware but itunes wont restore. It gets stucks on preparing iphone for restore. Then error. Also error when trying to restore to 3.1.3