Help to enable sound again

1

i turned off the sound beacuse the creen was flickering but it still did and now i want to enable it again. i used the:
cat <<EOF | sudo tee /etc/modprobe.d/blacklist-rgb-matrix.conf
blacklist snd_bcm2835
EOF

sudo update-initramfs -u

so how do i reverse it?

2

you need to learn basic linux. simply edit or remove the file.