[Solved] Tuya Wifi smart thermostat (as pictured) - how do I enter pairing mode?

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Hello.
I have bought a flat that has 4 of these controllers installed. Would like, to connect them to my Smart Life app, but to start with I would like to connect them to the new wifi network in the house. Unfortunately I don't have a user manual for them. I also don't know how to remove them from the wall so as not to damage them. Therefore, does anyone perhaps have a manual for this model of controller? Is there a way to enter pairing mode with the wifi network?

Looks like this product:
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"Arhatreya thermometer 3582154138510"
Perhaps it would be possible to write to the seller as to how it pairs?
https://houseiq.pl/pl/p/Termostat-WiFi-obciazalny-podl.-16A-Czarny-RT-TUYA/1621
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Or maybe a manual from another will help? Mam WT100-WH-3A/WT200-16A-W/WT50-WH-3A:
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Unfortunately there is only a similar.... The method in the manual does not work. I have found another one that you hold the + and - keys together for that length of time, but in this version of this driver there is a key lock .... A padlock appears on the screen.

Search as "myuet me82"

Try:
- is there a reset button? On the back of the case
- hold down the on button for 5s or
- hold +/- 10s or
- apply power 3 times

In this version, in fact, when the screen is switched off and only the switch-on key is illuminated, after holding down the + and - keys for about 5 seconds, the screen will light up in all its glory for a long moment and then go out. When the controller is switched on with the on button, the wifi icon will blink slowly on the screen in the corner. And one more tip, it pairs better with an app such as SMART LIFE having an android phone than using an iphone.