Restore Apple Watch Firmware with iPhone iOS 15.4

If your Apple Watch is stuck, unresponsive, or showing a red exclamation mark, restoring its firmware through your iPhone running iOS 15.4 can fix it without needing a computer. This guide walks you through the built-in restore process, what to prepare, and how to recover if things go wrong.

What You’ll Need

An iPhone running iOS 15.4 or later (the restore option is built into the Watch app).
The Apple Watch you want to restore, with at least 50% battery (or keep it on its charger).
A stable Wi-Fi connection on the iPhone.
The Apple Watch charger and its cable.
Your Apple ID password (for signing back in after restore).

Step-by-Step

Back up your watch (if possible). Open the Watch app on your iPhone, tap your watch name at the top, then tap the info (i) icon. Tap Unpair Apple Watch and confirm. This creates a backup on your iPhone. If the watch is unresponsive, skip this step—you can still restore, but you’ll lose recent data.
Place the watch on its charger. Keep it on the charger for the entire restore process. A dead battery during restore can permanently damage the watch.
Open the Watch app on your iPhone. Make sure Bluetooth is on and your iPhone is within a few feet of the watch.
Go to General > Reset. Scroll down and tap Erase Apple Watch Content and Settings. Confirm if prompted. This wipes the watch’s current data and prepares it for a fresh firmware install.
Wait for the watch to show the pairing screen. After erasing, the watch will restart and show a “Hello” screen or a message to bring your iPhone near it.
Start the restore via the Watch app. On your iPhone, the Watch app should automatically detect the watch in restore mode. If not, tap Start Pairing and follow the on-screen instructions. When asked, choose Restore from Backup (if you have one) or Set Up as New Watch.
Let the firmware reinstall. The Watch app will download the latest compatible firmware and push it to the watch. This can take 15–60 minutes. Keep the iPhone and watch close together, and do not switch apps or lock the iPhone.
Complete setup. Once the firmware is installed, the watch will restart and show the pairing animation. Follow the on-screen steps to set up your passcode, Apple ID, and other settings.

Common Mistakes

Unpairing instead of erasing. Unpairing from the Watch app is a backup step, not a restore. You must also erase the watch’s content (Step 4) to trigger a fresh firmware install.
Interrupting the restore. Locking the iPhone, closing the Watch app, or moving out of Bluetooth range can break the restore and leave the watch in a partial state.
Ignoring the charger. The watch must stay on its charger. If it runs out of battery mid-restore, the watch may become unrecoverable without Apple service.
Using an old iOS version. The restore option is only available on iOS 15.4 or later. Check your iPhone’s Software Update in Settings > General.

Tips

Use a 2.4 GHz Wi-Fi network. Some 5 GHz networks can cause download interruptions. If the restore fails repeatedly, switch your iPhone to a 2.4 GHz band.
Keep the watch close to the iPhone. A distance of less than 3 feet is ideal. Avoid walls or metal objects between them.
Restart both devices first. If the watch is unresponsive, force-restart it by holding the side button and Digital Crown together for 10 seconds until the Apple logo appears. Then try the restore.
Check storage on the iPhone. The firmware download can be over 1 GB. Free up space if needed.

Troubleshooting

The watch shows a red exclamation mark. This means the watch is in recovery mode. Keep it on the charger and open the Watch app on your iPhone. You should see a “Restore” option. Tap it and follow the prompts. If it doesn’t appear, force-restart both devices and try again.

The restore fails with an error. Common errors include “Unable to Restore” or “Connection Lost.” First, restart your iPhone and the watch. Then check your Wi-Fi and try again. If it still fails, try a different Wi-Fi network or reset your network settings on the iPhone (Settings > General > Reset > Reset Network Settings). This does not erase your data.

The watch is stuck on the Apple logo. This usually means the firmware is partially installed. Keep it on the charger and wait up to an hour. If it doesn’t recover, force-restart the watch, then attempt the restore again from the Watch app.

The Watch app doesn’t offer a restore option. Make sure your iPhone is on iOS 15.4 or later. If it is, try force-quitting the Watch app (swipe up from the bottom and swipe the app away), then reopen it. Also, ensure the watch is in recovery mode (red exclamation mark) or on the pairing screen.

Restore completes but the watch is still slow or glitchy. After a successful restore, it’s normal for the watch to take a few hours to index and sync. If problems persist, try erasing and restoring again, or contact Apple Support.

Frequently Asked Questions

Will restoring my Apple Watch delete my data? Yes, the restore erases all content and settings on the watch. If you have a backup from a prior unpairing, you can restore that data during setup.

Can I restore my Apple Watch without an iPhone? No, this method requires an iPhone with iOS 15.4 or later. If you don’t have one, you can try using a Mac or PC with the latest watchOS recovery tools, but that’s a separate process.

How long does the restore take? Typically 15 to 60 minutes, depending on your internet speed and the watch model. The watch may restart multiple times during the process.

What if my watch is not recognized at all? If the Watch app doesn’t show your watch, try force-restarting both devices and ensuring Bluetooth is on. If it still isn’t detected, put the watch in recovery mode (hold the side button and Digital Crown for 10 seconds) and try again.

Will this fix a watch that is stuck on the Apple logo? Yes, restoring the firmware can often resolve boot-loop issues. If the restore completes successfully, the watch should boot normally.

Do I need to update my iPhone to the latest iOS version first? It’s recommended to have the latest iOS 15.x version installed, as it includes the most recent restore tools and bug fixes.

General steps for current mainstream versions; menus can differ by device and version. See the disclaimer or report an error.

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