Need Help Upgrading 3.1.2 to 4.0 (3g)

[Macfanboy89]

Hey there,

I need help upgrading my 3g to 4.0. How would i go about it i've already look at the guides how to Jailbreak/Unlock to 4.0 but i believe i have to upgrade my 3.1.2 to 4.0 first before I can do redsn0w.

I've tried downloading the 4.0 from
IPhone Firmware Download Links - ModMyi - Wiki
and did "ALT"+Update but i get an error code and i also tried "ALT"+Restore i also get an error code. My Itunes is also updated to the new version.

What am I doing wrong??

Iphone 3G (8GB/T-mobile)
Verison 3.1.2(7D11)
Modem Firmware 04.26.08

Please help me out i've been at this for hours trying to figure this out

[Simon]

4.0 and up run pretty slow on a 3G so I wouldnt recommend it. But if you still want to do it then I suggest going to 4.1 (since 4.1 runs a little better on a 3G than 4.0) but use sn0wbreeze or pwnage tool to make a custom 4.1 so that your baseband does not get updated so you can unlock again. Do not restore to the stock 4.1 whatever you do or you will lose your unlock.

[Macfanboy89]

If 4.0 runs slow on 3G is there a point on Upgrading it to 4.0?

[Simon]

IMO no, 3.1.2 and 3.1.3 are the best it can get on a 3G if speed is a priority to you.

[Macfanboy89]

How would I go about restoring my phone? It's currently on 3.1.2 and I want to wipe my phone clean cause I just got it from a Friend and now its mine =]
But at the same time I want to keep my JB/UNlock cause I'm on T-mobile.

The reason I wanted to upgrade to 4.0 was that since I'm wiping my phone clean I might as well update it.

How can I bump up my 3.1.2 to 3.1.3 if there is any difference. I guess I don't need 4.0 since I'm not an intensive iphone user. Only going to use a few simple apps and games so I guess 4.0 not a biggie.

So how to go up to 3.1.2 to 3.1.3?

[Simon]

Just download the 3.1.3 firmware from here: iPod, iPhone and iPad Firmware Download

Press shift and click restore, a window will pop up where you can choose the 3.1.3 firmware you downloaded.
Once restored you have a few options to jailbreak.

1. If you have a ATT sim you can activate with that and then use jailbreakme.com to jailbreak then install ulstrasn0w from cydia to unlock.

2. If you dont have a ATT sim you can follow this guide: http://www.redmondpie.com/jailbreak-...redsn0w-0.9.4/

again just use ultrasn0w to unlock after jailbreaking.

[Macfanboy89]

Im on a Macbook btw so that might change things alittle ..Mayb lol

I did "Alt"+Restore and selected 3.1.3 that i downloaded earlier from the link in my first post and i get this error msg
"The iPhone could not be restored because the firmware file is not compatible"

What's wrong?

[Simon]

The procedure is pretty much the same on a Mac. There are links in that guide to the Mac version of redsnow 0.9.4 as well.

What is the file name and extension of the firmware you are trying to restore to?

[Macfanboy89]

iPhone2,1_3.1.3_7E18_Restore.ipsw

[Simon]

iPhone 3g is iPhone1,2_3.1.3_7E18.ipsw

You have a 3GS firmware there

[Macfanboy89]

okay Im downloading the new one right now. Does this mean i have to take out the word RESTORE as well or doesnt matter?

[Simon]

No that doesnt matter I left that out by mistake.

[Macfanboy89]

I was able to restore it back to 3.1.3 on Itunes.

But i tried redsn0w 0.9.3 , 0.9.4, and 0.9.5 when i try to import ipsw that I used to restore my phone it says "Unable to recognize specified IPSW"

[Simon]

You need to download the 3.1.2 firmware and put that into redsnow. Dont worry it will jailbreak 3.1.3 just fine.

[Macfanboy89]

Thanks, it worked perfectly

Now where do i get ultrasn0w? do i have to add a new source to Cydia or would searching in cydia pick it up?

[Simon]

install any updates cydia has for you first, then it will come up just by searching for it.

[mcbaron15]

Go to Cydia, go to Manage > Sources > Edit > Add. Enter repo666.ultrasn0w.com when it finishes search ultrasn0w or click on the repo666.ultrasn0w.com in the source list and it will show you all packages in that source, just scroll down to ultrasn0w.

EDIT: Didnt see x98car's post. That works too.