Alright, I've been trying a whole lot to downgrade/jailbreak my friends 3GS. It's and MB* model and the serial number says it's week 31, so it has an older bootrom. I've tried the hosts file hack and reverting to 3.1.2, no dice, it says the iphone isn't eligible for the restore. I've tried redsn0w... no pineapple comes us and redsn0w says it's done, but the iphone just sits with a black screen. When I try pwnage tool, itunes gives me some kind of 16## error. Is there any chance of me jailbreaking it?