COROS renewed its standard connection certificates on September 16, 2026. As part of this routine maintenance, iPhone users must update the COROS app to continue connecting to our servers and syncing their devices.
Updating only takes a few minutes. Your COROS account and previously synced activity history will not be affected.
Who is affected?
This applies to iPhone users running a COROS app version earlier than V4.9.11.
Users with an affected version may be unable to open or connect to the COROS app, sync their device, or access other connected features.
The Android app is not affected.
The latest COROS app requires iOS 15 or later. To check your iOS version, go to your iPhone’s Settings > General > About.
How to update
- Open the COROS App Store page on your iPhone.
- Tap Update.
- Once the update is complete, open the COROS app and sync your device.
If the Update option doesn’t appear:
- Tap your profile icon in the upper-right corner of the App Store.
- Pull down on the screen to refresh the available updates.
- Return to the COROS App Store page and check again.
- If the update still doesn’t appear and you’re using a version earlier than V4.9.11, restart your iPhone and try again.
FAQs
What if I didn’t update before September 16?
You can still update the COROS app at any time. Install version V4.9.11 or later through the App Store to restore connectivity.
Will I lose any data?
No. Everything you've synced is stored in your COROS account.
If you recorded any activities on your watch that are not syncing to the app, do not uninstall the app or reset your watch. Instead, please take photos of the unsynced workouts from your watch's history widget, and contact our support team so we can assist.
Was my account compromised?
No. Security certificates have a set expiration date and are replaced on a schedule. Your account and data are unaffected.
I opened the app recently. Do I still need to update?
We sent a configuration change to the app on September 12–13 that moves many older versions over automatically. Updating to V4.9.11 is still the surest way to keep connecting.
Need more help?
Our support team is here to help. Click here to contact COROS Support.