Method to Downgrade from iPhone 1.1.1 to 1.0.2 - MacRumors
Skip to Content

Method to Downgrade from iPhone 1.1.1 to 1.0.2

by

A method has been posted detailing how to downgrade your iPhone from 1.1.1 back to 1.0.2.

Preliminary reports say that the OS is downgrading but the modem firmware is not (aka, the modem firmware stays at 04.01.13_G instead of downgrading to 03.14.08_G). This allows use of Wi-Fi but not GSM functions (phone/edge/sms) unless you're using AT&T.

It appears to provide a method to bring the iPhone back to the 1.0.2, however the modem's firmware remains unchanged, and does not appear to work (no phone functionality), so is not a practical general solution at this time. But, if you do have a SIM Unlocked iPhone and prematurely upgraded to 1.1.1 already, this could provide a method to restore functionality of your iPhone.

SIM Unlocked iPhone users who have not upgraded should still avoid upgrading to 1.1.1 as you will lose your SIM unlock when the modem firmware gets upgraded. At this time the modem firmware upgrade is irreversible.

Related Forum: iPhone

Popular Stories

M5 Vision Pro Thumb 2

Apple Has Given Up on the Vision Pro After M5 Refresh Flop

Wednesday April 29, 2026 11:31 am PDT by
Apple has all but given up on the Vision Pro after the M5 model failed to revitalize interest in the device, MacRumors has learned. Apple updated the Vision Pro with a faster M5 chip and a more comfortable band in October 2025, but there were no other hardware changes, and consumers still weren't interested. The Vision Pro has been criticized for its high price tag and its uncomfortable...
Read Full Article • 685 comments
Four iPhone 18 Pro Colors Mock Feature

iPhone 18 Pro to Launch in September With These 10 New Features

Tuesday April 28, 2026 9:35 am PDT by
While the iPhone 18 Pro and iPhone 18 Pro Max are not launching until September, there are already plenty of rumors about the devices. It was initially reported that the iPhone 18 Pro models would have fully under-screen Face ID, with only a front camera visible in the top-left corner of the screen. However, the latest rumors indicate that only one Face ID component will be moved under the...
Read Full Article
iphone 17e magsafe

Apple Reportedly Questioning Whether iPhone Should Drop MagSafe

Wednesday April 29, 2026 8:26 am PDT by
A leaker claims Apple is currently embroiled in an internal debate over whether MagSafe should remain a standard iPhone feature. The Weibo leaker known as "Instant Digital" says that when MagSafe was first introduced, the mood inside Apple was reportedly aggressive about its expansion. MagSafe for the iPhone was introduced with the iPhone 12 lineup in 2020, bringing a ring of magnets to the...
Read Full Article • 234 comments