HELP TO UPGRADE FROM 3.1.2 TO 4.0.1 or later

[meycko]

iPhone 3GS 3.1.2 (7D11) with OLD BOOTROM (MB718LL/A), Firmware 05.11.07, Jailbraked with BlackRa1n and Unlocked with BlackSn0w.

I recently used TinyUmbrella:


09/09/2010 19:22:40.804 You are using the current version of TinyUmbrella.
09/09/2010 19:22:41.343 Device Detected
Device: iPhone3GS 3.1.2 (7D11)
Model: MB718LL/A
Name: iPhone 3GS
UUID: 2F36B9B5A917D3F1096752B95EE3C837226DA097
Baseband: 05.11.07 - 6.4_M3S2
09/09/2010 19:22:49.024 TSS Server has cached the following files:
09/09/2010 19:22:49.037 iPhone3GS 4.0.1 (8A306)-32648856398 09/09/2010 19:22:49.047 iPhone3GS 4.0.2 (8A400)-32648856398 09/09/2010 19:22:49.064 iPhone3GS 4.1 (8B117)-32648856398 09/09/2010 19:22:49.076 Devices with ECIDs matching the above AND restoring to the exact firmware version listed above will succeed!

Actually i want to upgrade to a iOS 4.x that i can jailbreak and unlock without problem

I really apreciate all kind of help

Thanxs!

Currently my operating system is Mac OS X

[iYeow]

Restore to a custom firmware either by Pwnage tools 4.0.1 or Snowbreeze 1.6.2 or 1.7. You need the stock firmware of 4.0 to cook your CFW.
Put your iphone into recovery mode and do the Shift + Restore..
Once you are restored, you are already jailbroken at iOS 4.0. This time unlock with Ultrasn0w.

[j3st3r]

also when making your custom firmware make sure you select the "activate" option

[meycko]

Hey yeow202!......EXCELET! thanxs so much! =)
One more question! =P
Can i upgrade to 4.0.1? HOW?
THANKS!

[j3st3r]

4.0.1 was a useless update, pretty much just changed the size of the signal bars, stay at 4.0 until a jailbreak for 4.1 is released

[RRDave]

I just did this exact upgrade today and encountered the "error 1600" when trying to do the upgrade after putting the iphone in recovery mode. I then tried from itunes without first putting the phone in recovery mode and it worked fine.
What is the advantage (if any) of putting the phone in recovery mode?