vB Easy Archive - DownGrading from 1.1.3 to 1.1.2 or 1.1.1

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DownGrading from 1.1.3 to 1.1.2 or 1.1.1
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Posted by: ual767

Hi Guys, I was just wondering how in the world do I downgrade my
software from 1.1.3 to 1.1.2 or 1.1.1. I have bootloader 3.9. The
problem is I can take the phone all the way down to 1.0.2 however
the baseband from 1.1.3 always survives. As soon as I hook up to
iTunes it says I need a valid unlocked sim, I suppose this has to do
with the baseband from 1.1.3. I am an AT&T customer with a valid
sim. Do I need to take the baseband back down to 1.1.1 or 1.1.2 or
can I use the 1.1.3 baseband but from what I have read install a
lockdown file from 1.1.3 baseband. Any help would be appreciated.

Thanks, Steve

Posted by: Lestat_d

Go to 1.1.1 with DFU restore in iTunes; do this *twice* to ensure solid downgrade; ignore error 1015, etc. Yes, twice ... trust me, I'm a doctor.
Jailbreakme.com
Installer community sources, and install and run Baseband downgrader to get appropriate baseband for 1.1.1 loaded
Do another 1.1.1 firmware DFU restore in iTunes -- to resync with Baseband.
Then go back up to 1.1.3 with DFU *RESTORE*, Ziphone, martini time...