Netgear AC1200 router power green blinking

Hello all,

Why I realise the problem at first was my discord channel suddenly showed "no route", so I went to check my AC1200 router and found out that the power light is blinking green. I tried turning it on/off and using the nighthawk app to reboot the router but was not working, the app can't find my router and my phone can't find my wifi either. Then, I saw that in the app, there was a router update so I pressed "check for updates", but in the middle, the app again popped out the sign of telling me to reconnect my router and I think I turned off the router at that time (I don't know did I worsen the situation 😞 ) although the app later said I successfully updated version, I still got the flashing green light. I also tried the reset method (pressing the reset button for 30 seconds), but no response. Then, I keep holding the reset button, turn off and turn on the router again, now the power light and ethernet port light both start blinking.

I also tried the TFTP method, so I followed the step from here: https://kb.netgear.com/000059633/How-do-I-upload-firmware-to-my-NETGEAR-router-using-a-TFTP-client-on-Microsoft-Windows

I disabled my wifi (I was using my phone data) before I started the procedures. But in step 10, my power light never turned orange it just kept flashing green. It was also not working, the tftpd64 either no response showing "block#0" or saying "cannot send data packet.l Tftp server may have been stopped error code: 10065 (a socket operation was attempted to an unreachable host)" after I pressed put.

I also tried to use the TFTP from the windows command prompt from here: https://kb.netgear.com/000059634/How-do-I-upload-firmware-to-my-NETGEAR-router-using-TFTP-from-the-Microsoft-Windows-Command-Prompt

but I stuck in step 5d 🙂 attached with the screenshot of the cmd (this is my first time using cmd...)

Can anyone please help?  Thanks a lot!