This might be redundant, but I would like to hear how and if I can upgrade my firmware to iOS4.0.
I have a 3gs, jailbreaked on my mac using blackra1n, on firmware 3.1.2, with baseband (modem firmware) 05.11.07
Step-by-step guide would be greatly appreciated!!!

Originally Posted by jane09186

This might be redundant, but I would like to hear how and if I can upgrade my firmware to iOS4.0.
I have a 3gs, jailbreaked on my mac using blackra1n, on firmware 3.1.2, with baseband (modem firmware) 05.11.07
Step-by-step guide would be greatly appreciated!!!

This has been answered before (if you seach around a bit),

You missed a few vital pieces of information that we need to give you the correct answer:

1. Old or new bootrom (do you need to re-run blackra1n each time you restart your iPhone?)
2. Do you rely on unlock?
3. Have you saved SHSH for your phone for 4.0, 4.0.1, 4.0.2 or 4.1 ??