iOS 4.2.1 (8C148a)

IPSW Firmware Unsigned
Product
Device
Version
4
Download
Official IPSW Download

Download iOS 4.2.1

Download OTA Update

This firmware is provided as a direct link to Apple's official servers. No mirroring or modification is performed.

Firmware Information

Version

iOS 4.2.1

Build ID

8C148a

Release Date

December 31, 1969

File Size

0.39 GB

File Name

MD5 Sum

d688d2d48c8b054367adef8e7ab4f5ea

SHA1 Sum

2787bb9fbf18594279d05682e6fd16d2b9612a2a

About this Device

Identifier

iPhone2,1

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Need help?

Our community guide has everything you need to know about restoring firmwares.

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How to Install?

Follow these critical steps to ensure a successful firmware installation.

1

Secure Your Data

Always start by creating a full backup of your device via iCloud or a computer to ensure your personal files are safe.

2

Establish Connection

Use a high-quality MFi-certified cable to connect your device to your Mac or PC.

3

Verify Security

Temporarily disable Find My in your iCloud settings to allow the restoration process to proceed.

4

Initiate Restore

Hold Option (Mac) or Shift (PC) while clicking Restore in Finder/iTunes, then select your downloaded IPSW.

5

Finalize Setup

Once the installation completes, follow the on-screen prompts to restore your data from your backup.