Signed IPSW files can be restored via Finder, the Apple Devices app, iTunes, or idevicerestore. Unsigned IPSWs cannot currently be restored to.

Unsigned IPSWs

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iPod touch 2G

iPhoneOS 2.1.1 (5F138)

September 5, 2008

269 MiB

iPod2,1_2.1.1_5F138_Restore.ipsw

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