Thanks Trooper Sam, but I've tried that along with everything else and no go ... But I have an iPod 2g mc model also and for some reason itunes let me downgrade it (after many days of trying) to 3.1.2, but when I go into cydia there is no shsh blobs for 3.1.2 weird right... So you think I should wait for a week or so for cydia to cache my 3.1.3 blobs ?
IF Cydia didn't cache your 3.1.3 by now, and you don't have the blobs locally, it's too late to get them. It's strange that Cydia never managed to get them, but if it didn't, there's really nothing you can do.