(adsbygoogle = window.adsbygoogle || []).push({}); I need to know if I can take my brothers ipod which is on 6.0 semi-tethered and downgrade my ipod using his

No .

Adding what Quantic Dream said to be more detailed is that each Ipod holds a unique Id which is called SHSH Blobs used to identify each Ipod/apple product. It's like a digital signature and can't be copy to another device.

No you cant you need you're SHSH blobs from other Firmwares like 6.0 to downgrade