Need help upgrading 3GS 5.11 3.12 to newest firmware

[Down_Shift]

I'm going to attempt to upgrade my Unlocked ra1n'd tmobile 3GS 16gb to 4.0.


How would I go by doing this?

Do an upgrade under Itunes? Will I lose all my apps and data?
Will I need to activate the phone again?

Will this finally solve the whole tethered unlock I had before?

[iYeow]

I'm going to attempt to upgrade my Unlocked ra1n'd tmobile 3GS 16gb to 4.0.


How would I go by doing this?

Do an upgrade under Itunes? Will I lose all my apps and data?
Will I need to activate the phone again?

Will this finally solve the whole tethered unlock I had before?

Let it restore to 4.0.1 through itunes, you will need a sim to activate your iphone. Jailbreakme.com to jailbreak. You can sync back your apps from Itunes.
This latest jailbreak is an untethered jailbreak.

[Down_Shift]

Will it sync my contacts and notes, calendars etc also?

What if I don't have a sim to reactivate the phone. I have the original ATT Sim that I cancelled to move back to Tmobile.. will that work?

Restore as in click "Update now" under the phone properties in Itunes, right?

[iYeow]

Yes, your contacts will sync back but the notes/calenders will not be there because you have to setup as a new Iphone. Yes, you can use the atnt sim to activate.
Do the restore mode , not update.