@PankajSurya 

Can you please use some other device (for example a smartphone) to determine the Wi-Fi channel that is used by the Hitron modem?

Note that a "US" version of the Archer C60 can only use channels 1 - 11 in the 2.4 GHz band and channels 36 - 48 and 149 - 165 in the 5 GHz band. 
An "EU" version of the Archer C60 can use channels 1 - 13 in the 2.4 GHz band and channels 36 - 48 in the 5 GHz band.
 

  @woozle 

Thanks for your response.
At my Hitron modem 

2.4 GHz Wireless is set for Auto(11).

5 GHz Wireless is set for Auto(36).

  @PankajSurya 

If the Hitron router uses channels 11 and 36, then the Archer C60 should be able to connect to the Hitron router.

What you could try is to enter the correct information manually into the fields "SSID (to be bridged)" and "MAC Address (to be bridged)" and then see whether the C60 connects to the Hitron router or not.

  @PankajSurya 

Hi, sorry for hijacking @woozle 

I use a similar method with the Archer C80 and found setting the wifi channels manually so they are the same on each router rather than auto works best for WDS

  @Muffinman 

Thanks Muffinman

I will give it a try .