Ramdisk not supported

The tool can't boot a ramdisk on this device. Apple's official firmware for it is listed below.

iOS firmware — currently signed 2

Apple only allows restoring to a signed version.

iOS 4.2.1 8C148 322.89 MB Download IPSW
iOS 4.1 8B117 308.17 MB Download IPSW
Archived firmware 14 no longer signed
iOS 4.0.2 8A400 305.38 MB Download
iOS 4.0.1 8A306 305.40 MB Download
iOS 4.0 8A293 292.09 MB Download
iOS 3.1.3 7E18 228.06 MB Download
iOS 3.1.2 7D11 241.60 MB Download
iOS 3.1 7C144 241.62 MB Download
iOS 3.0.1 7A400 230.10 MB Download
iOS 3.0 7A341 230.05 MB Download
iOS 2.2.1 5H11 246.39 MB Download
iOS 2.2 5G77 246.37 MB Download
iOS 2.1 5F136 237.79 MB Download
iOS 2.0.2 5C1 248.68 MB Download
iOS 2.0.1 5B108 249.12 MB Download
iOS 2.0 5A347 225.03 MB Download