Raspberry Pi 4, USB MASS STORAGE – USB Sound Not Working

CAUSE :

/boot

folder used to boot the system doesn’t match the

/boot

folder that was mounted

when sudo apt upgrade installed the new kernel.

SOLUTION

sudo umount /boot
sudo mount /dev/mmcblk0p1 /boot
sudo apt-get install –reinstall raspberrypi-bootloader raspberrypi-kernel

sudo umount /boot
sudo mount /dev/sda1 /boot
sudo apt-get install –reinstall raspberrypi-bootloader raspberrypi-kernel
sudo reboot