gl-s10 esphome pairing and signal strength

Hello everyone. Yesterday I received this nice little device. I added it to home assistant, which was complaining that the firmware was old. I updated it and it's now running Firmware: 2.1 (ESPHome 2025.7.5). I have two issues:
I can't put it into pairing mode, therefore I can't find it with my phone bluetooth
I use it as a receiver in bermuda trilateration, but I see it has very weak signal, fluctuating between -68 and -75 db while I'm standing in line of sight with my phone around one meter away from it (my shelly inside the wall and with no external antenna at approx the same distance has better rssi!)

Can you help me with those two issues? I'm not really sure how to proceed and a lookup on the net or AI chats didn't seem to have helped....

Thank you,
Roberto

We are unable to support the ESPhome firmware as it is not a firmware we have released.

Please check the official ESPhome docs for more information.