Can I Downgrade iPhone 2G?

iPhone 2G (iPhone1,1) - Front view

iPhone 2G

iPhone1,1

A1203
View Firmware Signing Status Check Other Device
Downgrade is Not Possible

No Signed Firmwares Available

There are currently no signed firmwares available for iPhone 2G.

Firmware History for iPhone 2G
iOS 3.1.3 7E18

January 22, 2010

Unsigned
iOS 3.1.2 7D11

October 5, 2009

Unsigned
iOS 3.1 7C144

September 3, 2009

Unsigned
iOS 3.0.1 7A400

July 31, 2009

Unsigned
iOS 3.0 7A341

June 10, 2009

Unsigned
iOS 2.2.1 5H11

January 22, 2009

Unsigned
iOS 2.2 5G77

November 17, 2008

Unsigned
iOS 2.1 5F136

September 5, 2008

Unsigned
Frequently Asked Questions

Can I downgrade from an iOS Beta on iPhone 2G?

Yes. If your iPhone 2G is running an iOS Beta, you can always restore back to the latest signed public release using Recovery Mode in Finder (Mac) or iTunes / Apple Devices (Windows).

Can I downgrade to the iOS version iPhone 2G originally shipped with?

No. Apple permanently closes the signing window for older releases. Even though iPhone 2G originally launched with an earlier version, Apple servers will no longer authenticate that installation.

What can I do if I cannot downgrade iPhone 2G but experience battery or performance bugs?

You can perform a clean restore to the latest signed firmware using a computer to eliminate software glitches and corrupted cache, or await the next minor point update from Apple that includes targeted bug fixes.

Can I downgrade iPhone 2G if the signing window has closed?

No. Apple servers reject restore verifications for unsigned builds (returning iTunes Error 3194). Unsigned firmware cannot be installed on standard Apple devices.

Will restoring or downgrading iPhone 2G erase data?

Yes. Flashing an IPSW firmware file requires a restore that wipes on-device storage. Ensure your personal data is backed up to iCloud before proceeding.