If you people are attempting to jailbreak iPhone using blackra1n RC3. Make sure everything is up to date and then proceed to jailbreak your iPhone. iTunes should be shut down and everything. While jailbreaking with blackra1n RC3, there are few problems faced by many of us. Fear not, we have got solutions for all the problems faced yet.

Here are some possible problems after using blacka1n RC3:
The problems with the jailbreak in recent 3GS iPhone, and can not solve the moment. Other problems may be caused by restoring the iPhone to backup, and not as new.
Solutions to the problems addressed above