I flashed cwm on my to my triumph so that I could install cm7. I made a backup of stock, then i proceeded to flash cm7 which was successful. I then decided to go back to stock so I made another backup of cm7, after that I tried to restore stock but cwm keeps saying md5sum mismatch and is unable to restore it. Can someone please help me fix this i don't know where I went wrong. Thanks in advance.