MIGRATE from iPhone 2G 3.1.2 to iPhone 4G 4.2.1 with Purchased Apps etc? How? Pls chk

[crashnburn]

MIGRATE from iPhone 2G 3.1.2 to iPhone 4G 4.2.1 with Purchased Apps etc ? How? Pls check outlined steps

Please guide me if the following steps are okay or need some fixing before I go ahead.

Using some steps that had outlined from a previous upgrade/ update here..
http://www.hackint0sh.org/f207/120342.htm

MIGRATE from iPhone 2G 3.1.2 to iPhone 4G 4.2.1 with Purchased Apps etc

STEPS:

iPhone 2G 8GB 3.1.2
- Sync & Backup my iPhone 2G using iTunes 10.1.x & MS Outlook

1. Sync your iPhone and make sure this includes a full backup. Check in the filesystem to ensure that the filestamps and size reflect this.
2. Copy (and rename) or zip up (or some other way of making a copy) the whole backup (the folder and it's contents)
   

New iPhone 4G 4.2.1 - SIM Unlocked Orange UK (Factory IMEI based Unlock)

SHSH save using TinyUmbrella

There is *no* trick or way to bypass this, the only person who can sign a 4.2.1 restore is Apple (and they stopped doing that a day or so after 4.3 was released)

TinyUmbrella can save your 4.3.1 SHSH (which is the only one that Apple is currently signing)

iTunes Synch: Install Purchased Apps, Synch Contacts

I have a few apps that I purchased via iTines that really matter to me and some apps that are Free.
I want to ensure that I can move/install these apps to the iPhone 4. I dont want to Jailbreak etc/ Cydia until I can sync my Purchased Apps.

I am wondering if the following sequence works? or should be altered slightly?

1. Set up your iPhone 4 as new (Already Done. Setup iPhone 4 as a New Phone in iTunes. This was done for the IMEI based Facrory iTunes Unlock)
2. Sync your apps, music, contacts etc from iTunes again.

Will the purchased apps get synched here? What steps do I need to follow carefully here? (The whole Authorize/ Deauthorize thing for iTunes Computers & Devices)

Once my Contacts & Apps are A-Ok, I can do Music as well but its not a big deal.

Jailbreak Only using Green Poison for iPhone 4.2.1

1. Jailbreak using Green Poison
2. Install Open SSH etc and so on..

SMS Database: Insert via Funbox from Backup.

Another critical item was to Punch in the SMS Database. I am hoping that the 3.1.2 Database wont have any issues when extracted and added to iPhone 4

[*]Use a backup extractor tool to manually extract from the 3.x (upgrade) backup the files you want to preserve.
[*]Copy them back to your iPhone with iFunBox or similar. Use SSH/SFT to verify that the permissions are the same.

I am assuming the Backup Extractor still works.

Restore lost and deleted iPhone files with the iPhone Backup Extractor windows
iPhone / iPod Touch Backup Extractor mac