Hi! Recently i jailbreak an iPhone 3G baseband 11.2007, version 3.1.2. It was locked by my carrier and i did not brought my SIM. Therefore, I used blackra1n and blacksn0w. However, the gps and youtube didnt work.

After searching on the internet, i installed Push Doctor via Cydia. However something happen, it restarted halfway. Now i couldnt open cydia, i tried to install cydia via blackra1n and it couldnt work.

How should i go about it to restore back to the original state so that i can jailbreak it using Pwnage tool 3.1.5 rather than blackra1n, as blackra1n has lots of problems.

Iphone 3G, just restore to stock firmware 3.1.2 then use redsn0w 0.9.2 to jailbreak it.
Don't use blackra1n to jailbreak.

is it using the "restore" function using iTunes?