Choose an IPSW for iOS 4.2.1

Signed IPSW files can be restored via iTunes. Unsigned IPSWs cannot currently be restored via iTunes.

Signed IPSWs

✓	iPod touch 2G	iOS 4.2.1 (8C148)	18th November 2010	364 MB	iPod2,1_4.2.1_8C148_Restore.ipsw
✓	iPhone 3G	iOS 4.2.1 (8C148)	18th November 2010	339 MB	iPhone1,2_4.2.1_8C148_Restore.ipsw

Unsigned IPSWs

✗	Apple TV 2G	iOS 4.2.1 (8C154)	13th December 2010	280 MB	AppleTV2,1_4.2.1_8C154_Restore.ipsw
✗	iPhone 3G[S]	iOS 4.2.1 (8C148a)	21st November 2010	421 MB	iPhone2,1_4.2.1_8C148a_Restore.ipsw
✗	iPod touch 4	iOS 4.2.1 (8C148)	18th November 2010	638 MB	iPod4,1_4.2.1_8C148_Restore.ipsw
✗	iPad 1	iOS 4.2.1 (8C148)	18th November 2010	578 MB	iPad1,1_4.2.1_8C148_Restore.ipsw
✗	iPhone 4 (GSM)	iOS 4.2.1 (8C148)	18th November 2010	655 MB	iPhone3,1_4.2.1_8C148_Restore.ipsw
✗	iPod touch 3	iOS 4.2.1 (8C148)	18th November 2010	408 MB	iPod3,1_4.2.1_8C148_Restore.ipsw