The CD that came with the device listed RTL8671B, but it's not on Realtek's website. Instead the manual points you to:
https://www.mytechkey.com/pages/driver
4.Bluetooth 5.0 Dongle
Driver Link:
https://www.dropbox.com/s/gwo9lz777i82f70/BT5.0%20Driver.zip?dl=0
Hope that helps someone.
https://github.com/peteristhegreat/drivers-backup/releases/tag/1.0
Direct link
https://github.com/peteristhegreat/drivers-backup/releases/download/1.0/BT5.0.Driver.zip
Adding visibility to @carkrueger 's comment below
If you look here: https://www.catalog.update.microsoft.com/Search.aspx?q=realtek+bluetooth+1.6.1015 You will find now: 1.6.1015.3014 from 11.01.2021
Direct download link: http://download.windowsupdate.com/c/msdownload/update/driver/drvs/2021/02/0d13721d-7aa7-47cf-887a-f53bcd228a5e_04c173bad44cec04d528d260392958dc6e5bcec3.cab
for backup purposes: h**ps://web.archive.org/web/20210216175344/http://download.windowsupdate.com/c/msdownload/update/driver/drvs/2021/02/0d13721d-7aa7-47cf-887a-f53bcd228a5e_04c173bad44cec04d528d260392958dc6e5bcec3.cab
Direct download and the popup window for 1.6.1015.3014
didn't initially work. I ended up needing to right click the link and select Save target as
.
For it to work for me on Windows 10, I unzipped the cab file into a folder and then used Device Manager to look at that folder. Worked like a charm.
Sorry for my english and a lot of letters. In general, after checking in the store, it worked fine with a smartphone (headphones support sbc and aac).
I brought it home, I connect it to the PC, they are not visible. I installed the native Chinese driver 1.6.1015.3010 - it does not work. Turned off the smartphone and tried to connect the headphones - DEFINED AND CONNECTED. Then, after disconnecting, they did not connect again. There were separate attempts to connect, but not to the end. Further, it gets worse and worse, installing different drivers did not help. Now only headphones are detected, but not connected.
Everything else is connected to the PC - nokia 101, xiaomi phone and even smart watches(all delete). It remains to wait for the full discharge of the headphones and boxing, maybe that will work out. Or, in extreme cases, reinstalling the system (now it costs win10 21h2 enterprise LTSC with the latest updates)