3GS iOS GM PwnageTool bundle
Updated with a GM link bundle
Old bootrom (untethered JB) iPhone 3GS required!
No lockdown patch => you need an official operator SIM to activate.
Useful for people who have access to 4.0 otherwise but want to keep their unlock.
You also need to replace Cydia bundle with a newer version because the one in PwnageTool 3.1.5 crashes on 4.0.
Things you need:
Dev-Team Blog - Pre-game show
Latest (at the time of posting) Cydia deb:
Extract the data.tar from deb in 7Zip or other tool..
and use 'tar xpvf data.tar' while in 'PwnageTool.app/Contents/Resources/CustomPackages/CydiaInstaller.bundle/files/' directory to update Cydia bundle shipped with PwnageTool.
The bundle itself, place in 'PwnageTool.app/Contents/Resources/FirmwareBundles/'
You need to restore the ipsw from a recovery mode on a jailbroken 3.1.2 or 4.0 Beta fw; Spirit JB doesn't patch iBoot and cannot be used to restore to custom firmware.