iPhone 3GS · iPhone2,1

iPhone 3GS · iOS 4.2.1

8C148aUnsigned

Catalog data · Last updated: Oct 23, 2026, 7:38 PM UTC

Restore IPSW for iPhone 3GS: iOS 4.2.1, build 8C148a.

Firmware information

Version: iOS 4.2.1
Build: 8C148a
IPSW: Restore IPSW
Size: 0.39 GB
Release date: Not available
File name: iPhone2,1_4.2.1_8C148a_Restore.ipsw
Download host: secure-appldnld.apple.com

IPSW download

Check the model and signing status before downloading.

Download IPSW

Download hostsecure-appldnld.apple.comiPhone2,1_4.2.1_8C148a_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-25609f3617fcf3e419e12c4a3c62f1fe0ab3909d0573a00937584124f869a7df15d

SHA-12787bb9fbf18594279d05682e6fd16d2b9612a2a

MD5d688d2d48c8b054367adef8e7ab4f5ea