Hello I recently bought on used iphone 4, it was passed to me working. that same night, i turn it off, and... it never came back alive. at first, it get stuck on apple logo. then, after conected to my laptop, it enters restore mode. when i get it, it had the ios 6.2.1 installed, whit cydia, but cydia had never runned, and the phone was never conected to internet with this ios version. I have no shsh blobs.... try to restore via redsn0w and itunes and get 1rror 1601 How do i restore the ios?? can i dowgrade it to ios 5.1.1?how? help please.