This device uses a Tasmota incompatible module which needs to be replaced with an ESP . Besides the module, this process will require a heat gun, soldering tools and moderate soldering skill. Read more about module replacement in a detailed guide.
Opening the device is not too hard but does take 15mins of patience! There are no screws and the 2 part shell is glued/welded together. To separate, find the seam at the back and very carefully use a sharp instrument to prize the seam to beak the seal. Once you have started it’s fairly easy to run around this seam with plastic/metal spudgers.
Once inside, remove existing WiFi module and replace with a ESP-02S or similar