For collectors, retro-tech enthusiasts, and everyday users looking to revive an old device, downgrading the iPhone 4s back to its original iOS 5 firmware brings back the blistering speed, skeletal skeuomorphic design, and nostalgia of early 2010s mobile computing.

Note: This tool runs best on Linux or macOS. If you are on Windows, you can run it via a Linux Live USB or a Linux Virtual Machine. Open your computer's Terminal.

The script will flash the custom iBSS, iBEC, and baseband components. A progress bar will appear on your iPhone screen, followed by the classic Apple logo.

The most reliable, modern method to achieve an untethered iOS 5 downgrade on an A5 device uses a command-line utility called (developed by LukeZGD), running on a macOS or Linux computer. Tools Required

Choose how much internal storage you want to allocate to your new iOS 5 partition.

iOS 5 features the iconic skeuomorphic design language crafted under Steve Jobs. You get the classic glass dock, faux-leather textures in the Calendar app, the linen Notification Center, and the photorealistic YouTube and Maps apps. Battery Efficiency

Some iOS 5 builds require an iPhone 4s that was previously activated on that version. Without saved blobs, you may get stuck at the “Activation Error” screen despite a valid SIM.

Are you looking to downgrade your iPhone 4S from a newer version of iOS to iOS 5? Perhaps you're experiencing compatibility issues with certain apps or want to revisit the classic iOS 5 interface. Whatever your reason, downgrading your iPhone 4S to iOS 5 can be a bit tricky, but we're here to help.

If you chose to jailbreak and Cydia throws connection errors, it is because modern web security certificates have changed. Search online for legacy iOS repository fixes to patch Cydia's access protocols.

I can provide troubleshooting steps or direct download links tailored to your specific setup. Share public link

A computer running or Linux (Windows is highly unstable for these specific low-level USB exploits). A high-quality, data-sync compatible 30-pin USB cable .

If you do not have saved blobs, a popular "virtual" downgrade method involves .

Jailbreak your new iOS 5 installation using Absinthe or built-in tool options.

Go to . The device will believe it is running a launch-day iOS 5 firmware and will prompt you to download the "iOS 6.1.3 OTA Update". Download and install this update normally. Step 2: Push from iOS 6.1.3 down to iOS 5.1.1

While Apple stopped signing iOS 5 over a decade ago, modern tools have made it possible to return to this version through various methods, depending on whether you have saved SHSH blobs or are willing to accept a tethered experience. Understanding Your Options