iOS 12.3.1 (21E258)

IPSW Firmware Currently Signed
Product
Device
Version
4
Download
Official IPSW Download

Download iOS 12.3.1

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 12.3.1

Build ID

21E258

Release Date

March 31, 2022

File Size

12.92 GB

File Name

MD5 Sum

6c943a751207e9e06ab018a7bb568d40

SHA1 Sum

81033c922c5d43f57907d063fb01865f4c856b37

About this Device

Identifier

MacBookPro18,4

See all firmwares

Need help?

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

Read Guide

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.