Upgrade unlocked jailbroken 3gs from 4.2.1 to 4.3.3?
I would like to upgrade a jailbroken and unlocked 3gs from 4.2.1 to 4.3.3 and again have it jailbroken and unlocked. I have my 4.3.3 SHSH files. I do not know what jailbreak / unlock method was used, but I know I have Modem Firmware 05.11.07. Bootrom is unknown (old or new).
I am thinking I will do the following - would this be the right way to proceed?
Upgrade and Jailbreak
1) Start my tiny umbrella TSS server so my 4.3.3 SHSH is available for use.
2) Run Pwnage Tool 18.104.22.168 and create a custom firmware for 4.3.3. Make sure I do NOT check Enable baseband update in order to preserve my 05.11.07 modem firmware.
3) Load my custom firmware into the 3gs via iTunes using paned DFU mode.
These steps are described at
iClarified - iPhone - How to Jailbreak Your iPhone 3GS Using PwnageTool (Mac) [4.3.3]
I plan to use iTunes 10.2.2 and pwnage tool 22.214.171.124 on a Mac.
I am thinking I should use BlackSn0w, per these instructions, right?
iClarified - iPhone - How to Unlock the iPhone 3G, 3GS Using BlackSn0w