I installed LEDE on Archer C7 v2 but I have an issue that is the blinking leds of the router. In router web page there is the configuration option for Led lights but I cannot manage how to configure it to blink property. For example system light is always on, if I tried a different configuration sometimes all light are on! The router is working great but I cannot figure out the led configuration. My router lights are green but in configuration is mentioned blue!
So you what exactly is your end goal in the LED configuration? Just so that the system LED blinks as it does when under the stock firmware? If so just set the trigger on the system LED to a timer. The duration it will be on and off is expressed in milliseconds. So if you enter the values 750 on both it will be on for 0.75 seconds and off for 0.75 seconds, blinking at that rate.
Have you found out why the led names contains ":blue:" although the physical LEDs are green?
Is it possible to turn off the power LED?
(Model: Archer C7 v2)
In quite a few cases TP-Link changed the LED colour during their production run, in subsequent (minor) hardware revisions. While I haven't followed the archer c7 closely enough, that has happened to the tl-wdr3600/ tl-wdr4300 (early revisions had blue LEDs, later production runs switched to green ones) - maybe for price reasons, maybe because the blue LEDs age quicker (LEDs shining often get visibly darker).