[albrevng]

Fellow users I need some help in restoring a never jailbreaked/unlocked phone with OS 3.0. I managed to create
the custom ipsw using Pwnage Tool but doing restore in ITunes-I have error 1604
that is after about 15 minutes in "Preparing the software for iPhone" state. I noticed the original(iPhone OS 3.0) ipsw file size is 230.1mB while the custom ipsw file size is 233.4mB.
I tried restoring(DFU) the custom ipsw 5X but to no avail and the weird thing is- restoring the original ipsw works consistenly.

Can anybody shed a light on this? Thanks in advance.

June 24, 2009
- By the way, I have Rogers as my carrier (Canada); if that matters?
June 24, 2009 9:52AM Eastern Time
- After restoring to original iPhone OS 3.0, I used redsn0w 0.7 (MAC version) and my phone is now jailbroken, that is with Cydia
installed. SO IT iS a HAPPY ENDING AFTER ALL. Now unlocking I will.... using ultrasn0w. I'll keep you updated.

[Zwayne]

The phone needs to be in DFU mode to install the custom ipsw.

[albrevng]

Yes, I did that 5X and fails-it goes to restore process but fails after 5mins. on error 1604. Maybe the restore process is checking the file size and checksum and calls home to Apple?

[albrevng]

USE redsn0w, my experience with Pwnage tool was not very promising. I think because the custom firmware this tool created had a bigger file size than Apple firmware and therefore a different checksum. And performing a DFU to the custom firmware, everytime fails. When performing a restore, iTunes calls home (to Apple), and I think it verifies that what you are restoring is the right firmware by performing a checksum in the restoring process.
That is what I think it is.

[Zwayne]

I know OS X 10.5.6 breaks the DFU mode, you can update to 10.5.7 and itunes 8.2.

[albrevng]

I perform the jailbreaking on my daughter's Macbook with OS X 10.5.7 and the same thing happened. I was not successful.