I would be very grateful for a helping hand to upgrade my iphone 3g, with 3.0.1 firmware and 04.26.08 baseband, already jailbroken (with redsnow) and unlocked (with ultrasnow). I'm still using iTunes 126.96.36.199 as I've understood it's mandatory to stay on the safe side.
I have some very important (for me) unofficially apps (sling player is one example) and some very important settings I want to keep. Now, more and more apps request at least 3.1.2 or even 4.1 to be able to install and use them.
I'm an old IT guy, but I am pc/windows oriented, and my youth was centered around 8080/z80 architectures, so my mind seems to be organized a little bit different, because I do not understand why there is no tool around, able to completely back-up (as a memory image) the device with all the apps and settings, to be able to patch that image "off-line" with the new version of the firmware and to restore the patched image into the iphone (this is just a thought).
So, there is someone with enough patience to help me to upgrade my iphone to the latest safe firmware (with unlock) and with all my current apps and settings to remain in place?