I was able to turn the silent mode on and off for Oukitel BP2000 by pressing the USB button for 2 seconds.

I got this information from the Oukitel P5000 user manual and it seems to work the same way for BP2000:

QuotePress and hold the USB button for 2 seconds to enter silent mode.

I recently purchased one, US branded as FFPower BP2000, as I have three P2001 units I have used daily for over a year.

The manual mentions a display icon for a "Silent mode" but does not mention what it does or how to enable it.

The most irritating thing for me is a beeping sound it makes at dawn/dusk, the P2001s were terrible for this also. I had hoped this setting would allow me to leave it on solar/PV connection while I sleep and not be disturbed.

I also notice there is a bluetooth signal from the BP2000 but no mention of an app or way to interface with it.

I use it for off grid cooking in my on grid home. Unlike the P2001, it does not beep if the inverter or control panel is powered on, so as its winter, I typically leave it on overnight and shut it down before going to work.

I greatly appreciate any knowledge or insights. While the predecessor got US reviews, it seems no one has taken an interest in this one. While the build quality might be below the segment leaders, they have been used almost every day & never failed to start or power anything 120V, so I thought a revised model was worth checking out for the higher PV limit, adjusting charge speed, and expansion capability.
However, if I can squeeze more out of it, I will gladly do so.
My next biggest complaint is the GX16 output. 24V is nice, but I just got set up to use XT60 outputs on the previous model. If I find an adapter cable, I will use it charge other power stations, since splitting PV sources has been mixed.