Member Coca Cola reports success downgrading a 3G iPod Touch 8GB from the new 3.1.3 to 3.1.2 without SHSH signature signing. He apparently has achieved this using the 2G iPod touch 3.1.2 firmware and this somehow allowed a downgrade. He also reports success jailbreaking this downgraded device using PwnageTool. A great find if it’s true and there’s discussion of its feasibility and other reports of success in the thread.
As we all know, the new 3G iPod touch 8GB (MC serial) is exactly the same as the old 2G (MB serial) except that the 3G uses the new bootrom that effects signature signing to retrieve blobs for firmware activation.
We’d love to hear more on this from any iPod touch 3g 8GB owners who’ve tried this. If you do then please post up details of your success in the comments.
Full credit to Coca Cola – Sufyan
Edit/ by all accounts this method for downgrading iPod touch 8GB with MC serial does indeed work but we still aren’t quite sure why!