Help 3.1.3 upgrade to 4.0 not working

[zoolman88]

U can use snowbreeze 2.0.2 to make a 3GS 4.1 firmware

[Simon]

sn0wbreeze will not work for new bootrom 3GS

Ive followed all the steps, and it almost finishes but always gives me an error

Do you have itunes 10 installed?

I read up on error 37 and it seems it may be caused by a firewall or antivirus. Disable these when you try the restore. You will also need to use redsn0w again to put it in dfu.

Do you have zonealarm installed by any chance?

[raceking777]

Well its now stuck in dfu mode i think, its just a black screen! and i cant get it to turn on> I do have zone alarm and itunes 10. Im gonna disable zonealarm and give it another shot tonight when I get home.

[Simon]

Ya when I googled that error I found a whole thread of people on the apple forum with that issue and the constant was all of them had zonealarm. Just disable that then try the steps again and you should be fine.

[raceking777]

Ya when I googled that error I found a whole thread of people on the apple forum with that issue and the constant was all of them had zonealarm. Just disable that then try the steps again and you should be fine.

Cool thanks. but shouldn't i still be able to power the phone up? right now it wont do anything!

[Simon]

You are probably just stuck in dfu. Hold the home and power button together for 30seconds to a minute and see if you get the apple logo.

[raceking777]

well tried it again. now getting error 21. nothing is working

[Simon]

Error 21 is a usb problem I believe. You can try a different usb slot (or even a different computer if you can) and try the process again.
You can also check here on some solutions for error 21: Blosmo.com: How To Fix iTunes "Error 21" For iPhone and iPod touch

Did you try holding down power and home button for at least 30 seconds with the device connected to your computer to get out of dfu?

[raceking777]

Well finally got it to work, but not the custom 4.1. I tried everything and didn't work. Ended up having to go back to regular 4.1. Now gotta wait for the unlock

[Simon]

Damn, too bad you getting get it working. Well hopefully you wont have too long to wait to unlock, it should be out very soon.

[raceking777]

So there's no way to downgrade the baseband in 4.1 and unlock it in the mean time? Pretty much have to wait? Also if I did try the custom file again, would it still keep ku current baseband?

[Simon]

No there is no way. You are stuck now until the unlock comes out.