3GS - How to downgrade from 3.1.3 to 3.1.2 (CYDIA shsh & WINDOWS)

Guys,
If you have been unfortunate enough to have upgraded your firmware to 3.1.3 then there is a way to downgrade to 3.1.2 .
This will then give you an opportunity to re-jailbreak .
This is a guide if you have already updated to 3.1.3 , if you have not updated to 3.1.3 but your phone needs a restore and you dont want to use iTunes server but Cydia's , then use This

Before you get excited here are a few GOLDEN RULES before commencing.


a.)You must have your SHSH hash files backed up on CYDIA
(Sauriks) Server

b.)Your iPhone must have been previously jailbroken.

c.) You can only use official sims after the downgrade is complete , this is a guide how to downgrade and re-jailbreak , not unlock , it will not allow you to use other sims in your phone .

d.)Using Windows .

_______________________________________________________________
OK heres how to do it ....

STEP 1.)
Follow the downgrade methods of pointing the host file to Cydia as described :
On your Windows PC Browse C->WINDOWS->system32->drivers->etc
(if you installed Windows on a different drive letter browse to that on instead of "C")
Right click on hosts and select Open.



Choose Notepad and click OK.



Add "74.208.10.249 gs.apple.com" at the end of the file. Save it.





STEP 2.)
-Download QUICKPWN221 (aka Quickpwn2.2-1) and unzip to a folder or desktop. *I'll tell you when to use this, this will get you out of recovery and give you your offical carrier.*



STEP 3.)
Download a Custom copy of firmware 3.1.2 HERE
, and save it to your desktop



STEP 4.)
-Open itunes

-Plug your iPhone in

-Put your phone in DFU mode not Recovery mode (hold Sleep and Home 10 seconds, let go of the Sleep and continue to hold Home 10 seconds till a pop up on iTunes tells you you're in Recovery mode and need to restore in order to continue)

-Hold SHIFT and click RESTORE at the same time

-Browse to the custom 3.1.2 you downloaded to your desk top (remember STEP 3) Select the 3.1.2 ipsw file and restore

-When it's done you will get an error 1015 or 1014 ***That's ok because that means you're backed up on Cydia and it's communicating

-Now, you will be in Recovery mode (You will see Disk and Connection cord on screen)

-Hold SHIFT and RESTORE (again) and again browse to the custom 3.1.2 file on your desktop , Select the custom 3.1.2 ipsw file again and then hit restore.

-Same error message 1015 will appear

-Now start Quickpwn22 while your still hooked up to itunes

-Quickpwn will give you a message that says "Hold Sleep and Home for 15sec then let go of Home and continue to hold Sleep for 2 seconds" *This will get you out of recovery and your official carrier back*

-Close Quickpwn after this
Congrats you have no rolled back your firmware to 3.1.2

Now to re-jailbreak:

Option : Blackra1n .
Go to HERE
Select your operating system (Windows or Mac )
Download to your desktop .
Plug your phone into your P.C , wait , (If iTunes opens , close it)
Double click on the "blackra1n.exe" on your desktop .
Click "make it rain"
Follow the instructions
10 secs later ..your jailbroken.

On your phone you will see a "blackra1n" App .
Open it .
Install Cydia (This is a jailbreak community portal ) .

END.

Your now rolled back to 3.1.2 and jailbroken




Hope this Helps .

M.