I've got an iPhone 3G with BaseBand 05.15.04. It's already jailbreaked but ultrasn0w isn't working unfortunately - I'm just getting "Searching" or "No Service". Therefor I decided to install the iPad BaseBand and then downgrade to a lower BaseBand... But if I choose Install iPad Baseband (Redsn0w) it shows no error but if I look on the phone it still says BaseBand 5.15.04.
Why is that and how can I solve this problem?