[GUIDE] Downgrade baseband from 1.1.4 to 1.1.3
Here is how to downgrade the baseband from 4.04.15_G (1.1.4) to 4.03.13_G (1.1.3)
NOTE: THIS IS FOR 3.9BL ONLY
To do a full baseband and software downgrade:
1 -Put iPhone into DFU mode (if you are not sure how, use ziphone)
2 -Click Shift + Restore in iTunes and select the 1.1.3 firmware
3 -At the end, iTunes will give error 1015. Thais a good thing :) it means the OS downgrade was successful. Use ibrickr or independence or whatever to get out of recovery mode.
4 -Jailbreak using ZiPhone GUI, available from www.ziphone.0rg (replace 0 in 0rg with o). Click the boxes for Jailbreak and activate (and SIM unlock if you wish) and click whatever button starts the ZiPhone process (varies from windows to mac etc)
5 -Go into settings -> general -> auto lock and set to never
6 -In installer.app add the source http://www.appledailytimes.com/installer
7 -Go back to the install tab. There should be a category called "Apple Daily Times"
8 -Go into the Apple Daily Times category and install 1.1.4 - 1.1.3 baseband downgrader.
-(If there are any errors let me know by emailing me: firstname.lastname@example.org
9 -Wait a while as the baseband is downgraded
If you are on 1.1.4 and want to stay on 1.1.4 but have the 1.1.3 baseband:
-Start from number 5 in the guide above
AGAIN, IF THERE ARE ANY PROBLEMS, PLEASE FEEL FREE TO EMAIL ME: email@example.com
http://www.appledailytime$.com (replace $ with s)
It can be used on ipsf unlock
Cool. Just edited it to say BL3.9 only
Originally Posted by sh1n1gam1
And yes, this can be allpied to an ipsf-style unlock, as it dies not touch the seczone. When you do a restore to the same version or higher in iTunes, iTunes does the same thing: runs bbupdater. (eg if I restore 1.1.3 to 1.1.3 or higher iTunes will run bbupdater to reflash the baseband)
The only difference here is you are deleting the baseband (nowhere near the seczone) and then running bbupdater to put the baseband back - in this case, a lower one then when you started.
In fact, you can find bbupdater in the iPhone software restore file.
You could even run ieraser (to erase baseband) and then restore in iTunes in DFU mode to the previous version. You wouldn't get error 1015, because 1015 means "I can't restore the baseband because its a lower one than the current one" iTunes would happily see "oh, there isn't a baseband here. I better put it back" and then you also would have downgraded your baseband.