I had no bluetooth issues with kernel 5.4.XX until I updated to kernel 5.8.0. I can't select 5.4.XX from Grub, is not there.
If I type dpkg --list | grep linux-image | grep ^ii on the terminal that's the result:
ii  linux-image-5.8.0-38-generic               5.8.0-38.43~20.04.1                   amd64        Signed kernel image generic
ii  linux-image-5.8.0-40-generic               5.8.0-40.45~20.04.1                   amd64        Signed kernel image generic
ii  linux-image-generic-hwe-20.04              5.8.0.40.45~20.04.25                  amd64        Generic Linux kernel image
How can I downgrade to the latest kernel 5.4.xx again?
 
    