Forerunner 265S won't pair with Garmin Connect after factory reset (recognized by Garmin Express)

Hi everyone,

I'm hoping someone has seen this before.

My Forerunner 265S stopped pairing after I switched to a new iPhone. At first it paired once, but it kept randomly disconnecting. After that, it stopped pairing completely.

Here is everything I've already tried:

  • Removed the watch from my old iPhone.
  • Restarted both the watch and the iPhone several times.
  • Reset the watch settings.
  • Performed a full factory reset (Erase Data and Reset Defaults).
  • Reinstalled Garmin Connect.
  • Tried pairing with two different iPhones (both running iOS 26.5.2).
  • The watch enters pairing mode and displays the QR code, but it just stays on that screen indefinitely.
  • Garmin Connect cannot find the watch, and iOS eventually displays "Unable to Add Accessory."
  • Garmin Connect does not appear under Settings > Privacy & Security > Bluetooth on either iPhone. Interestingly, Connect IQ does appear there.
  • Connect IQ also cannot find the watch.
  • Garmin Express on Windows recognizes the watch immediately.
  • The watch syncs successfully through USB.
  • The firmware is up to date (Version 28.05).
  • No pending updates are available.

So at this point:

  • USB communication works perfectly.
  • The watch appears to function normally.
  • The only issue is Bluetooth pairing.

Has anyone experienced this before?

Is there a way to reinstall or reset the Bluetooth firmware/module separately from a factory reset?

Or does this sound more like a hardware issue with the BLE radio?

Any suggestions would be greatly appreciated.

Thank you!