Use the ‘Administration’ -> ‘Commands’ feature to run the LED controls commands.

LED Control on my R7000 (build 39960M) was successful with the following commands:

# Disable four LAN LEDs
et robowr 0x0 0x18 0x1ff
et robowr 0x0 0x18 0x0
et robowr 0x0 0x1a 0x0

# disable WPS button LED
gpio disable 14

# disable WLAN button LED
gpio disable 15
gpio disable 16

# turn off 2.4GHz LED
gpio enable 13

# turn off 5GHz LED
gpio enable 12

# turn off power LED white
gpio enable 2

read also this related article on the DD-WRT Forum

R7000 LED Control
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