Please make sure it is a v2 camera since v1 and v2 camera has different ways to flash. To identify your camera model, you can go to Settings -> Device Info and check for model. v1 model is Wyze Cam and v2 model is Wyze Cam v2.
We also published a video for flashing at https://www.youtube.com/watch?v=vzu5aNePOz8. You can take a look and verify the steps.
If you have verified your models and steps, please contact firstname.lastname@example.org for a camera replacement.
Note: for v1, the flashing steps are at https://www.wyzecam.com/forums/topic/flashing-your-wyzecam-v2-firmware.