Always better to ask, I would rather help and show and not have you flounder around. I will go get the steps and attach them here.
Also, I work with @WyzeBaohua on some of this. If this all fails, they may be able to help with flashing firmware OTA. But I believe you should try to do it first.
You would go here for the FW, and can download it by clicking on the version number for the device you would like.