Trekstor laptop bluetooth adapter not working in Kubuntu 21.04
Solution 1:
I've found the solution !
After an internet search i've found the missing firmware named BCM4343A0.hcd (i had to rename it correctly) then i've copied it in folder /usr/lib/frimware/brcm. After a reboot the Bluetooth was working fine.
The file was shown missing by sudo dmesg | grep Blue
The firmware was downloaded here Frirmware for Broadcom BCM4343A0
More info here missing /usr/lib/firmware/brcm/BCM4343A0.hcd
Thx anyway :D