iPhone 4 (GSM) · iPhone3,1

iPhone 4 (GSM) · iOS 4.2.1

8C148Unsigned

Catalog data · Last updated: Oct 23, 2026, 3:07 PM UTC

Restore IPSW for iPhone 4 (GSM): iOS 4.2.1, build 8C148.

Firmware information

Version: iOS 4.2.1
Build: 8C148
IPSW: Restore IPSW
Size: 0.61 GB
Release date: Not available
File name: iPhone3,1_4.2.1_8C148_Restore.ipsw
Download host: secure-appldnld.apple.com

IPSW download

Check the model and signing status before downloading.

Download IPSW

Download hostsecure-appldnld.apple.comiPhone3,1_4.2.1_8C148_Restore.ipsw

Back up before you restore. A restore can erase the data on the device. The identifier has to match, and a file you can download may still be rejected for restore.

Checksum

SHA-1b8b485c111fc25515487dbada0f2e630b66ccdb1

MD593957e7bd21f0549b60a60485c13206a