here are the amendments to boot/config.txt file. For BULLSEYE, you have to use different parameters to make them work
these work for pi3 and pi 4
Pre BULLSEYE
Disable the PWR LED
dtparam=pwr_led_trigger=none
dtparam=pwr_led_activelow=off
Disable the Activity LED
dtparam=act_led_trigger=none
dtparam=act_led_activelow=off
Disable ethernet port LEDs
dtparam=eth_led0=4
dtparam=eth_led1=4
BULLSEYE ONLY
Disable the PWR LED
dtparam=pwr_led_trigger=default-on
dtparam=pwr_led_activelow=off
Disable the Activity LED
dtparam=act_led_trigger=none
dtparam=act_led_activelow=off
Disable Ethernet port LEDs
dtparam=eth_led0=4
dtparam=eth_led1=4