The Realtek WiFi Network Controller RTL8852BE is not supported by the 6.1.0 Linux kernel shipped with Debian 12 Bookworm. In this page you can find the steps required to compile and install the required kernel module and firmware.

• Disable the Secure Boot in BIOS.
• Compile the rtw89-dkms Debian package into a chroot environment.
• Install the rtw89-dkms package into the target host, it will compile and install the kernel modules,
• Download and install the rtw8852b_fw-1.bin firmware.

A self compiled kernel module is strictly tied to the running kernel, so it must be re-compiled whenever the kernel package is upgraded. The official Debian kernel is properly signed, so it runs even if the Secure Boot option is enabled into the BIOS. But the self compiled kernel module is a non-trusted software running at kernel level, so it requires that the Secure Boot into the BIOS to be disabled.

mkdir -p /usr/local/src/chroot/dkms
debootstrap bookworm /usr/local/src/chroot/dkms http://deb.debian.org/debian/

chroot /usr/local/src/chroot/dkms

apt install locales
dpkg-reconfigure locales
apt install dh-dkms debhelper build-essential devscripts git-build-recipe

cd /usr/local/src
git clone https://github.com/lwfinger/rtw89.git
cd /usr/local/src/rtw89
git clean -xfd
git deborig HEAD
dpkg-buildpackage -us -uc

• https://github.com/lwfinger/rtw89
• https://easylinuxtipsproject.blogspot.com/p/realtek.html