Download iOS Firmware 12.5 Build 16H20 For iPhone 5S (GSM)
question] I just got an iPhone 5s on iOS 8.4. How can I make maximum use out of it without updating the firmware? And I want to jailbreak it too. : r/LegacyJailbreak
Fluff] iPhone 5 and 4S running original firmware : r/LegacyJailbreak
How To Flash Iphone 5S IOS 11 And 10.3.2 With 3uTools / Download iOS Firmware for iPhone 6 / 7 / 8 - YouTube