Standard iTunes restores to iOS 7 will fail with an error code (such as Error 3194), because Apple refuses to validate the installation. Tethered vs. Untethered Downgrades
SHSH blobs are unique digital signatures saved from your specific device while Apple was still signing a specific iOS version.
Click the button and choose the iOS 7 firmware file you downloaded earlier. Click Downgrade . Downgrade Iphone 5s To Ios 7
USB-C to Lightning cables often fail to trigger the required Device Firmware Update (DFU) exploit exploit correctly.
If you used a tethered downgrade method, your phone will screen-flash or enter a boot loop if it turns off. To turn the device back on, you must plug it back into your Mac, open your downgrade tool, and select the option. This pushes the necessary boot chains to the phone to start the iOS 7 operating system. Risks and Limitations Standard iTunes restores to iOS 7 will fail
If you happened to save SHSH blobs for iOS 7 when it was still supported, you can perform a permanent, untethered downgrade using Legacy iOS Kit CoolBooter (Dual Booting):
Even with saved SHSH blobs, 64-bit downgrades face a secondary roadblock: the Secure Enclave Processor (SEP). The SEP handles Touch ID and security data. Click the button and choose the iOS 7
iOS 12's SEP is generally incompatible with iOS 7. This means even with blobs, a "clean" downgrade often results in a broken Touch ID or a device that won't boot. 3. Dual-Booting (CoolBooter) This is the most common way to experience iOS 7 today.
This process completely wipes the device. iCloud backups made on modern iOS versions (like iOS 12, the final version for the 5s) cannot be restored onto an older iOS 7 system. To help tailor this process for you, let me know: Do you have saved SHSH blobs for iOS 7? Do you have access to a Mac with a USB-A port ? Are you comfortable using the macOS Terminal ?