How can I take off the sensor from the back plate when opened?

"I have the same problem. The battery tutorial doesn't help. The question is not how to loosen the ribbon cable, that's easy.

The question is how to remove the sensor and other parts from the old back cover (right on the photo) to the new back cover (left on the photo).

Anyone know how to do this?"

"I managed to loosen the magnet (the block at the botton) by prying at the edges between the plastic which is part of the back cover (the one that is already on the new one) and the piece.

The black plastic dots holding the pulse sensor plate in the center seem to be molded, so I wedged a tool under the metal place and “broke” it off. It then fits on the unmolded plastic pins on the new back cover. HOWEVER, my watch is showing ""Tighten band and keep wrist still and level. Try again” when I try to measure my pulse. So apparently even after multiple tries I failed to properly fix it to the new back cover …"

"I had the same Problem.

You will need to break the four black points, take it off (there is a square ring of adhesive for the middle sensor, that you will scratch off). The new backplate had a new adhesive ring, and there are four black pins, where the new sensor is mounted on. And with heat (I used a solder iron), you can melt the pins and they will then hold the sensor in place, the same way the old plate did."