how to downgrade jailbroken 3g 4.0.2 to lower firmware?

[Amacron]

how do I downgrade my 3g to something less then 4.0.2 firmware? How do u lunlock the iphone 3g

Thank you in advance

 

[Applejuiced]

You can go down to 3.1.3
Whats your modem firmware right now?

 

[Amacron]

05.13.04 modem firmware

 

[Applejuiced]

You're good.
Once you JB you can unlock it with ultrasnow.
Just make sure not to update or restore to official 4.1 firmware.

 

[Amacron]

I have just finished JB it no how do you downgrade to 3.1.3 and then how do you unlock it. I am a newbie at this. thanks for your help

 

[guitardave62000]

I have just finished JB it no how do you downgrade to 3.1.3 and then how do you unlock it. I am a newbie at this. thanks for your help

http://lifehacker.com/5572003/how-to-downgrade-your-iphone-3g[s]-from-ios-4-to-ios-313

 

[Applejuiced]

You're JB right now on what firmware? 4.0.2?
You dont have to downgrade if you dont want.
Just open up cydia and install ultrasnow to unlock it.

 

[Amacron]

yes jailbroke on 4.0.2. the only reason I was considering downgradeing is 4.0.2 is very slow. Do I dL ultrasnow on the phone of on my pc?

Again thanks for your help

 

[Applejuiced]

No you open cydia and install ultrasnow from there. You don't download
It on your computer.