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I tried to install iphone fw 2.0, and now I know I was so stupid, then I start to downgrade the FW, I tried to restore to FW 1.1.4, but itunes stuck at an error 1604 and the phone stuck at endless loop which between a boot screen and a restore screen, after one hour searching finially I found my answer.

what you need?

• ibrickr
• itunes7.5
• patched ziphone
• iplus2.0b

1. First of all you need to restore back to FW 2.0. (fix 1604 issue)
2. Make sure your iphone still connect to PC.
3. Hold both on/off and the home button until the phone turned off.
4. Now hold the home button until you see the restore alert on itunes while the phone is still on black screen.
5. Do a restore to FW 1.1.4 (click on restore while holding “shift” on your keyboard) .
6. After the restore you will see error 1015 on itunes. This is ok, it means that your baseband can not be downgraded. Press “ok”.
7. Now run ibrickr and click on “boot the iphone”. You will see a red screen, that is good and you phone will restart in few seconds. If you see a green screen, its ok just turn back to step 5.
8. Use the Patched ziphone to downgrade baseband.
9. use iplus2.0b to unlock you iphone. iplus2.0b how to guide is here.
10. Last step you need to install bootNeuter from installer to unlock baseband and if you like you can change back to bootloader4.6.

You are good to go !

BTW Do not install FW 2.0 Just not yet  Be patient.