Create a new folder on your Desktop and name it Downgrade .
This guide is for educational purposes. Downgrading an iPhone requires specific signing windows and technical steps. Apple frequently stops signing older iOS versions. This process may not work if 10.3.3 is no longer signed for the iPhone 5s at the time of reading. Proceed at your own risk; data loss is guaranteed.
While native tools like iTunes do not support this downgrade , you can downgrade an iOS 10.3.3 on Windows using third-party scripts and Linux-based tools iphone 5s downgrade to 10.3.3 windows
This is critical. DFU (Device Firmware Update) mode allows the bootrom exploit to inject code.
To do this, your iPhone must be (or in a state where you can set the boot nonce). Create a new folder on your Desktop and name it Downgrade
You use your iPhone 5s as a music player, retro gaming device, or secondary phone for calls/texts.
While most modern tools for this process are designed for macOS or Linux, you can successfully perform this downgrade on by using a Linux Live USB or specialized tools that bridge the gap. Why Downgrade to iOS 10.3.3? Apple frequently stops signing older iOS versions
However, downgrading on Windows is trickier than on a Mac because you cannot use the native Finder or iTunes signing methods. You will need specialized tools.
Apple still signs iOS 10.3.3 for the iPhone 5s, even though iTunes restores are blocked. LeetDown exploits this by putting the device into a state where it accepts the OTA manifest for a full restore.