Ive been researching how to jailbreak my iphone recently. Upon getting 4.0, i realised that its simply not that great. I really really want to jailbreak but i have never jailbroken before thus i have no blobs. Is it possible for me to downgrade from 4.0 to 3.1.3 and then jailbreak. i have the new bootrom. Im frustrated to no end. any and all help would be appreciated. i fear the worst.

there are plenty of post m8 about downgrading back to 3.1.3 if u do downgrade u will be able to jailbreak your phone in my own experince i updated to 4.0 and lost my jailbreak so i then downgraded bck to 3.1.3 and jailbroke it again with spirit so give it a try m8

so i can downgrade even though ive never done it before and have no shsh saved? ive read so much that im really confused on what to do. there are no straight forward steps that ive seen. maybe i havent looked hard enough. can someone show me the way to a good post on it?

its a 3gs, running 4.0 (8a293)
mc model

From what i have read on here and my own trys, you CAN'Tdowngrade your iphone from 4.0 Unless you have backups from tinyunbrella or saurik's server.

now before you restore with another ipsw itunes sends a restore request for approval to apple and if itunes receives approval to restore then it will restore but the problem is apple only approves 4.0 now.

but we do know that sooner or later a way to do all this will emerge. hopefully very soon.

oh ok well thats what i was fearing. im tired of being patient lol
Well thank yall very much for the replies. i appreciate it very much.

Originally Posted by tmo9110

oh ok well thats what i was fearing. im tired of being patient lol
Well thank yall very much for the replies. i appreciate it very much.

haha oh i can't stand waiting for it!

yea i waited so patiently for the ios4 thinking itd be worth waiting for instead of jailbreaking. boy that was one of the biggest fails of the century. i would i ask, "what was i thinking", but im not sure i was thinking at all

The answers are correct. There have been warnings about backing up your SHSH blobs since september. Prior to that both geohot and devteam advised backing up IBEC/IBSS (which was later discovered to be not enough for a full restore/downgrade)

With Firmware Umbrella you did not even need to jailbreak to backup your SHSH blob. So your initial excuse of never having jailbroken is irrelevant.

Advice for 3GS owners with new bootroms was to avoid iOS 4.0 and stay with OS 3.1.2 - again repeated ad nauseum here and in other jailbreaking forums. It was only (somewhat) safe for a 3GS user to try iOS 4.0 if you had SHSH blobs.

The immediate future seems to be either userland jailbreaks or tethered jailbreaks for 3GS and newer - be aware of this and start being safe - get your 4.0 SHSH before 4.0.1 comes out!