IPSW Portal

Choose aProduct→Choose aPlatform→Choose aVersion→ClickDownload

Download 4.2.1 (8C148) for iPhone 3G

Version:	4.2.1
Build:	8C148
Signed:	Yes
Size:	0.32 GB
Upload Date:	2010-11-18 17:30:48
SHA1:	d2ed58586e8ca2153f2e2ec585bba8afc5173378
MD5:	8b1657935408a1638b69740b282f62b3
SHA256:	98e5969c3baed660c9a26e94cd7ed4b3cdb7175900f448bcc2223bf885835ce0

Secure download directly from Apple's servers