I have a 3GS that's JB with pwnage tool having cydia and winterboard installed happily. This morning I installed blacksn0w and tried to unlock it, everything went find until it restarts. After that I can only get it to the silver apple logo and nothing happens. It will only accept Power+Home , it flashes then apple logo again. Since then I was only able to restore it with a mac and it will not let me use the previous 3.1.2 ipsw to restore, giving me an error code. So I was forced to restore to the apple 3.1.2. I then use blackra1n to JB it, work ok, installed cydia but once i install winterboard, it will only reboots to the apple logo, stuck again. After trying to restore/JB it multiple times and didn't help. Then I use pwnage tool to JB it, the process went ok, then once I installed winterboard and reboot it froze at the apple logo again. Can anyone help??? Are there any other app I can use to put custom theme?