So basically was updating my friends phone to 5.1.1 I updated it with custom firmware with no bb, I think I put a old bootrom on when it was a new bootrom. It works but its tethered even when using the latest firmware of redsn0w I used and rocky racoon wont work for me either. Tried restoring with the new bootrom in pwnd dfu mode that didn't work kept getting the iphone not eligible for requested build error. Then I just booted from tethered and tried restoring using itunes normal restore , keep getting the 1600 error. Dont know what to do now really stuck Thanks for any help in advance.