Lexman D06 Doorbell

Hello everyone,
Newly registered on this site, I wish you: a happy end-of-year celebration despite the gloomy atmosphere, and a 2021 under better auspices.
I bought a Lexman D06 wireless doorbell and I'm unable to change the basic ringtone to one of the 7 melodies offered.
In advance, thank you for shedding light on this for me.
Looking forward to hearing from you.

3 answers