SKU:DFR0767 CM4 Router Board -- Turn off LEDs

Hi,

Is it possible to turn off the LEDs on the Raspberry Pi CM4 Router Board from software? I have tried these settings (config.txt) which work on a standard RPi 4:
 

Code: Select all[pi4] # 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

But that has no effect on the Router Board. 

Currently I use black duct tape, but software would be a more elegant solution.