GNU/Linux Debian Trixie Realtek Bluetooth Driver Setup Guide
How to Install Realtek Wifi/Bluetooth Wireless Driver on Debian Trixie 13 GNU/Linux – Step-by-step Tutorial.
Especially relevant: here below you find the Realtek Wireless Driver Debian Trixie Setup Guides for some of the most Common Adapters.
Please be aware of how this Driver is Not supporting all the Linux Kernels range, so in case of issue consult the available Online Documentation.
So as a possible Solution, then you may also see: How to Install New Kernel Guide.
Again, in case of Issue for preventing any possible Driver loading Interference you should also take into account: How to Blacklist Kernel Modules.
Important: If Wi‑Fi works but Bluetooth doesn’t, first update linux-firmware from the latest trunk to fix missing firmware files. See the firmware update guide.
Install Realtek Bluetooth Driver on Debian 13