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A little google goes a long way...

3gs W/3.1.3 baseband 5.12.01 new bootloader
"SOL" Sheriff Hashim found an exploit but handed it over to the dev team, and the general consensus is that they are going to wait till 4.0 to release anything else.

People who have the old bootrom are and have 3.1.3 5.12.01 are able to downgrade their devices to 3.1.2 and the older baseband as long as you backed up shsh file on Cydia's servers when you set it up.

Myself??? I am 100% SOL ... For now

Re: can you unlock 3.1.3?
 

that's the same data I got.

so what I did was use my Diamond as a wifi router, (after jailbreaking 3.1.3) and downloaded fuzzy band. now I need a tmobile sim card to see if I have 6.04 bootloader or 5.08, apparently if you have 5.08 bootloader (on 3.1.3 - 5.12.01) you can downgrade to a lower baseband and unlock.

jailbreak is possible for ANY phone firmware. It is worth it to JB your 3.1.3 just to see if maybe the bootloader wasn't updated, cuz then you can still unlock.


if my bootloader is 6.04 im just gonna sell this thing for $350 cash and buy an 8gb 3G with 3.1.2 for like $250 or so (and actually make some money off the whole transaction as well as get an unlockable iphone)

Re: can you unlock 3.1.3?
 

hmm..where do you find the link to "jailbreak" model "MC" 3.1.3. 5.12.01 3GS?? I would like to know because from what I understand it can not be done.

Re: can you unlock 3.1.3?
 

no you cannot install blackrain or snow on the 3.1.3 - 5.12.01 3GS, only the 3G. So you're pretty much screwed for now. I got it to work because I have a 3G.

I'd honestly recommend you just sell your 3GS and buy a 3G and make a little money as well as JB your iphone.

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I'm just going to keep my 3GS for now, sooner or later there will be a jailbreaking app released for me.