COROS is renewing its standard connection certificates on September 16, 2026. As part of this regular maintenance, the COROS app needs to be updated to keep communicating with our servers.
Who is affected?
iPhone users running a COROS app version older than V4.9.11 and iPhones older than iOS 15 can't connect to COROS or sync with your watch.
The Android app is not affected.
To check which COROS app version you have, open the COROS app to the Profile page > Settings > App Version. To check your iOS version, go to your iPhone settings > General > About.
How to update
- Open the App Store on your iPhone.
- Search for "COROS" and tap Update. (Don't see Update? Tap your profile icon at the top right of the App Store and pull down to refresh.)
To update your iOS version, go to your iPhone settings > General > Software Update.
Need more help?
Our support team is here to help. Click here to contact COROS Support.
FAQs
What if I miss the date, and I don't update before September 16?
The app update should only take a few minutes. Your account and activity history aren't affected. If you miss the date, and have questions, please contact customer support through our Help Center as in-app support service may be unavailable on older versions of the app.
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.