How To Downgrade iPhone 3G From iOS 4 To iPhone OS 3.1.3

ant

my phone tells me It "can not be restored because the firmware file is not compatible"

after I chose the 3.1.3 file and AlT clicking restore.

It is sooooo sloooooow please help me.

Juani

Hi, I did the process of downgrade a jailbreak 3g phone from 4.0 to 3.1.3 At the end itunes did not prompt any error message and went to reset the phone, now it says the sim card is not supported and the phone is stuck on emergency calls connect to itunes window. Please help

leo

Yeah it was shift on windows 7 ..thanks

Slam

All went really, really well - until the restore. The back-up file was made in OS4 and isn't compatible with 3.1.3 - therefore having to go back to OS4.

JD

You have to install it using dos prompt (add -i)

Jonas

Got stuck with "can not be restored because the firmware file is not compatible" but after some googling I wound this downgrade file instead and it worked well:
http://jaxov.com/2009/10/apple-iphone-firmware-os-3-1-2-available-now/

JD

After figuring out libusb needs a -i to actually install it worked like a charm. Unfortunately i was not aware that the backup file would be lost useless and i had quite some important information in my notes and agenda, so now going back to OS4 to recover this info, and next back to good old speedy 3.1.3 :-)
Thanks!

elise

i was able to downgrade successfully after a couple of tries... took me 2.5 hours because i had issues with recboot and libusb but was able to resolve everything using the resources on this page and the recboot page link.
thank you very very much!!! :)

Tony

is there any ways to restore content (sms, contacts, pictures) from back up which was running on 4.0.1 to 3.1.3???

Tam

Works perfectly ! I use mac downgraded from OS 4.0.2 to 3.1.3

Aaron

if i downgrade an unlocked/jailbroken iphone, will it relock and unjailbreak the iphone?

Bree

Thank you for the tips - used to downgrade from iOS 4.0 to 3.1.2 (my last unlocked backup). I gave 4.0 6 weeks, and just got tired of dealing with the keyboard slowness and overall delays. I even deleted all my music files, and it still was molasses. I'll just have to wait for the iPhone 4 to be reasonably priced on eBay.

Bree

Yes, you'll need to run Pwnage Tool or Redsn0w again.

Aaron

do I have to activate it with an AT&T sim card after downgrading ?

louie

this is happening for me! all i want to do is downgrade why is that so fricken hard!

Ryan

im using 3G running on iOS4 then i jail break it with http://jailbreakme.com

will this work? i want to restore my 3G to 3.1.3

thanks

Ryan

encountered a problem on (b)
im using a windows pc

instead of "alt+restore" its now shift+restore

Julius

hi friend, after downgrading did u have to unlock ur phone or jailbreak again? or did it just worked well? pls help i want to downgrade my phone and i am afraid it might lock.

Lithos

Just a few words to say thanks !

Olof

worked perfectly...

guayca

Hold down Shift+Alt and click Restore. Works for me that way on Windows. :)

guayca

Worked like a charm, thank you soooooo much, my iPhone was such a mess since the upgrade.
(Windows Vista, iTunes 9.2, iPhone 3G on OS 4.0.1 back to 3.1.3!)

Katie

HELP! I achieved this successfully but when I go to set up my phone to my old settings, it says that it "cannot be restored to this iPhone because the software on the iPhone is too old.

Now what?

Kris

Thanks! worked great on 3G phone. went from 4.0 to 3.1.3 with no problems.

isaiahmendezsocal@yahoo.com

Thanks Dev Team!!!!
Took me a bit since it was my first time but got it!!
Can this be done on my touch? its running 4.0.2

Kazza

Thanks so much, I was thinking of buying a new phone but you've save my iphone! Just a few things with the process. You need to press the shift key + restore to get the option to load from a specific file (not alt)- I'm in the UK- maybe its different in other regions.

I couldn't seem to download the version 3.1.3 too easily but found it in my recycle bin, might be an easier method for anyone confused by this stage, I copied it to the itunes folder and it worked fine.
The recboot and .net 4 firmware were essential (i'm using XP)

Thanks again

kazza

ibux

Works like a charm!

lang

downgrade was successful, but now i've lost all my photos, info, and data stored on my phone, as well as my app settings, etc. ....very distressing.

is there any way or anywhere to go find and restore these items perhaps from a backup file somewhere.

kam95

wil this work on a 1g?

Andy

iOS 4 did not support the original iPhone so this guide is not relevant to 1g.