If your watch is completely frozen and won't respond to taps, a force reboot may be necessary before you can attempt a reset. Force Reboot : Press and hold the Side Button for at least 12 to 15 seconds

If your touchscreen is functioning and responsive, you can initiate a factory reset directly from the settings menu on the watch face.

If your watch is frozen and the screen won't respond, you can force it to reboot without losing data: Hold for 12–15 Seconds : Press and hold the side power button continuously. Keep holding until the watch vibrates and the appears on the screen, then release the button. re-pairing your watch to a new device after the reset? Redmi Watch 3 FAQ - Xiaomi Philippines

Ensure your watch has at least 30% battery charge. A shutdown during a factory reset can corrupt the firmware and brick the device.

Tap the Check mark or Yes/Ok button to confirm. The watch will vibrate, erase all data, and restart to the initial setup screen. Method 2: Forced Reboot/Reset Menu (Unresponsive Screen)