S5LBox

Classic iPhone OS. On your iPhone.

Slide to unlock. Open an old favorite. Make it yours again.

S5LBox brings the iPhone 3G and its original iPhone OS 3.1.3 to your iPhone. It's the real operating system, running inside an app—not a theme or a recreation. Your iPhone doesn't need to be jailbroken.

Download S5LBox

iPhone OS

Controls

Packages

• Rediscover the classics. Explore the familiar Home screen, built-in apps, and compatible apps from the early days of iPhone.
• Set up in a few taps. Download iPhone OS inside S5LBox, or import your own firmware file. It checks and prepares everything for you—no keys to enter.
• Bring your apps. Import .ipa files directly or put them in S5LBox's IPAs folder in Files. Choose what to install, one app at a time, without closing the running machine.
• Browse Legacy Store. Search for apps, choose compatible archived versions, and download them straight into your library.
• Explore your files. Browse, preview, import, and export guest files from Machine Settings. Full filesystem access is available after guest jailbreak.
• Install tweaks and themes. Add Cydia and use the built-in Packages browser to explore sources, search, install, update, and remove packages. It handles required packages and tells you when a restart is needed.
• Keep your own collection. Create separate machines for different apps and experiments. Name them, keep their data separate, and let storage grow as you fill it. Smaller disks are available in Advanced.
• Pick up where you left off. Save and resume your session.
• Stay in control. Use Home, sleep, volume, and silent controls, pause when you need to, and connect your machine to the internet. Sound and microphone support are also available, though still experimental.

Everyday controls stay simple. Choose the modern, Home-only, or classic interface in Advanced, alongside the extra options.

You'll need an iPhone running iOS 13 or later and several gigabytes of free storage.

1. Download S5LBox.ipa from Releases and install it with your preferred IPA installer.
2. Open S5LBox and tap Download iPhone OS. Already have the iPhone 3G's iPhone OS 3.1.3 firmware file? Choose Import IPSW instead.
3. Keep S5LBox open while setup finishes, then tap Start iPhone OS.

When you're done, choose Save & close to keep your place. Firmware downloads come directly from Apple; Apple firmware is not included with S5LBox.

S5LBox is experimental. Speed varies by device, and not every app, tweak, or hardware feature works yet. Apps must be compatible with iPhone OS 3.1.3 and the iPhone 3G; copy-protected app files cannot be installed. Some apps need AppSync, which is included with new guest jailbreaks by default.

Packages is still experimental and may need a guest respring or reboot to connect. Use Cydia when a package operation is not supported.

Keep a backup of anything important before experimenting.

• Changelog
• Installing apps · Packages and tweaks
• Guest files
• Audio · Storage options
• Building and technical details · Architecture
• Report a problem

MIT. Created by j0shua-SYSON. The guest package helper includes Apple Csu code under APSL. S5LBox is an independent project, not affiliated with or endorsed by Apple.