So after facing a lot of problems with the slow or no response to commands by using the abovementioned binding , I decided to give tasmota another try.
My devices were connected to EWElink and as you mentioned, it was not possible to flash them. So the right procedure was to hold the button 5s 2 times, then I was able to connect to the AP of the mini and connect it to my wifi. After that I was able to flash it.
On one occasion I had to re-add the mini with the EWELink app, otherwise I was not able to open the page 10.10.7.1, although I was connected to the AP of the mini.