Any luck with Luckarms?

I have a Luckarm doorbell on my door.
Cases are uninteresting both for button and for receiver - no FCC ID, no frequency, no model number, nothing.
Frequency analyzer doesn’t react on holding button. Googling suggested a frequency of 315MHz.
Flipper admits hearing RAW transmission, but at pretty low RSSI (-85 or even less, depending on modulation) even when back-to-back with button. Replaying the capture doesn’t trigger the bell on any of default modulations (AM650 shows the best RSSI).
So, if it’s unsupported modulation? Or my personal problem? Have someone been successful in recording signals of Luckarms?

After reading forum more, I found a very similar topic.
@Spildit, was you able to proceed further?