HI All 

am facing an issue with resetting my Deco M4 , the story began when the power goes off during an upgrade and snice that timw am trying too boot or upgrade the device with no luck , i tried the below but the Mesh router led turns solid yellow them turn off ( turns black) 

1 - i tried to long press the reset button with no change 

2- tried to long press the reset while powering up the device with no change 

any ideas to solve the isssue 

Thanks