Problem with shsh, when try upgrade to ios6.

Hi guys. So, i have a problem when i want upgrade my iPhone 4 for ios6 without updating baseband, the problem come appears the fecth or the saved shsh. The problem it is the redsnow tells me that couldn't find my blobs, i try submit manually, but yet tells me couldn't find him. I try, also, indicate the files, but it tells me is not valid files. The few times that redsnow don't asked for the blobs, it starts and progresses a bit, but when appears "wait for reboot", iphone restarts and turn it on normally, and on screen of redsnow appears "Exploit failled". I hope you can help me, i research, but no results. Problem with shsh, when i try upgrade to ios6.