AC 1200 Smart wifi router with external Antennas Model R6220; Firmware Version V1.1.0.110

AC 1200 Smart wifi router with external Antennas  Model R6220; Firmware Version V1.1.0.110

Based on an email received from Netgear on/around 09-October-2021, I updated the firmware of my Netgear router Model R6220 to the latest. (Previous updating was as per their recommendations vide email of around 27-March-2021)

However since the last updation of my router (ie since about 09Oct2021), seemingly I am unable to Access Netflix and Prime Video using my Amazon Fire stick and Mi Box 4K Firestick, when connected using my existing Internet service provider MACH1).

(Prior to 09Oct2021 for atleast the past about 2 years, both the fire sticks have been streaming both Netflix and Prime video using the same service provider.) The connection subscription is with fibre cable and speed of 100 Mbps. (Last speed check indicated download speed as 95.92 and upload speed as 74.52 Mbps.)

The said programmes ie Netflix and Prime video can be accessed by me directly on my mobile phones and Laptops through my existing internet service provider, however on the firestick (while using internet connection from my service provider) NETFLIX shows the error 

"Netflix has encountered an error Code:NW-2-5"; and Prime Video shows the error "Internet Connection Error - We're unable to connect to Prime Video. Please verify your device's Internet connection. Error Code PLR_PRS_CALL_FAILED”.

On each of the Firesticks, I can access YOU TUBE using the service providers Internet connection.

When I connect each of the fire sticks using my Mobile service providers Internet connections (Airtel/VI & Jio) I am able to access both Netflix and Prime Video easily.

I have contacted the customer care at Amazon/Prime video who say that as the sites Netflix and Prime Videos are accessible on the fire sticks using the Mobile phone service providers/ networks, hence the fire sticks therefore are seemingly OK.

My Internet service providers also say that as the relevant sites Netflix and Prime Video can be accessed on the Laptops and Mobile Phones using their internet service directly, they suspect something could have affected either on the fire sticks or on the router settings.

We have also rebooted/factory reset each of the firesticks and reentered the amazon username and passwords, but still the problem remains.

Hence we request for your advice if anyone has faced a similar problem and seek advice how the same was overcome.

Please advice