Downgrading an to iOS 7 is technically possible but comes with significant functional trade-offs depending on whether you have saved "SHSH blobs" for that specific device. The "State of the Downgrade" in 2026
If your 5s is already on iOS 12, you cannot use the OTA method. You must rely on the bootrom exploit. This is a tethered downgrade. Downgrade Iphone 5s To Ios 7
If your iPhone 5s is running iOS 12.5.7 (the last supported version), you can jailbreak it using tools like (via a computer) or Unc0ver/Dopamine depending on the specific sub-version. A jailbreak allows you to access the root filesystem. Downgrading an to iOS 7 is technically possible
Back up your data: A downgrade requires a full wipe. Modern iOS 12 backups will not work on iOS 7. Downgrade Iphone 5s To Ios 7