Hi, i have a JB iphone 3gs old boot week 28, Modem Firmware 05.11.07, MC model, with ECID keys for 3.0, 3.01, 3.1, 3.1.2 and 3.1.3 (recently downloaded to my pc with Umbrella application) i don't need unlock cause i have an official carrier. I have experienced terrible battery issues and i wondering if taking back to 3.0 or 3.0.1 firmware can resolve this (if that is possible). And if so what will be the best method to do it.

PD. I own a windows PC with Windows 7 running.

Thanks for this excellent forum..

Originally Posted by angelhawk

Hi, i have a JB iphone 3gs old boot week 28, Modem Firmware 05.11.07, MC model, with ECID keys for 3.0, 3.01, 3.1, 3.1.2 and 3.1.3 (recently downloaded to my pc with Umbrella application) i don't need unlock cause i have an official carrier. I have experienced terrible battery issues and i wondering if taking back to 3.0 or 3.0.1 firmware can resolve this (if that is possible). And if so what will be the best method to do it.

PD. I own a windows PC with Windows 7 running.

Thanks for this excellent forum..

If you have the SHSH keys for 3.0.x downloaded to your PC, you can use TinyTSS to restore to 3.0 or 3.0.1 That will not downgrade your baseband but as you don't require unlock this should not matter much.

You usually have to restore twice to downgrade to 3.0.x from 3.1 the first time fails but the second time succeeds. This is something to do with changes in the way the NAND is formatted.

Battery issues can be a real hardware problem, what symptoms do you have?