This file fix Bluetooth: hci0: command tx timeout

Quick

curl -sL https://gist.githubusercontent.com/novaws/456ffc308e4c2356b60fb2c21767ccef/raw/740de007b740da734194ce9c017aaa8ee27c358e/rtl8761bu_install.sh | bash -

Manual

backup old.

mv /lib/firmware/rtl_bt/rtl8761bu_fw.bin.zst /lib/firmware/rtl_bt/rtl8761bu_fw.bin.zst.old

install new

cp rtl8761b_mp_chip_bt40_fw_asic_rom_patch_new.dat /lib/firmware/rtl_bt/rtl8761bu_fw.bin

remove and insert dongle.