iPhone 3gs 4.3 downgraded and unlocked without problems!

1. Downgrade to 4.1, u ill get error 1015
2. Tinyumbrella: Kick out of recovery mode
3. Redsn0w, install bb 6.15 AND Cydia
4. Install ultrasn0w from cydia.
5. Restart
6. Full signal. Enjoy!!

Thanks...