Ramdisk not supported

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

Archived firmware 18 no longer signed
iOS 3.1.3 7E18 227.28 MB Download
iOS 3.1.2 7D11 240.82 MB Download
iOS 3.1 7C144 240.84 MB Download
iOS 3.0.1 7A400 229.30 MB Download
iOS 3.0 7A341 229.26 MB Download
iOS 2.2.1 5H11 245.66 MB Download
iOS 2.2 5G77 245.64 MB Download
iOS 2.1 5F136 230.95 MB Download
iOS 2.0.2 5C1 241.84 MB Download
iOS 2.0.1 5B108 242.28 MB Download
iOS 2.0 5A347 218.17 MB Download
iOS 1.1.4 4A102 162.07 MB Download
iOS 1.1.3 4A93 162.08 MB Download
iOS 1.1.2 3B48b 160.15 MB Download
iOS 1.1.1 3A109a 152.27 MB Download
iOS 1.0.2 1C28 91.20 MB Download
iOS 1.0.1 1C25 91.20 MB Download
iOS 1.0 1A543a 91.18 MB Download