[sagher]

@rudra i am just confused. as above you write a subject for the specific router model. " tp-link SR20 router". so i replied you accordingly. i am not talking about upgrade. i am talking about downgrade. as @HR said. TP-link is not so good brand. D-link is more preferable then this. anyways. if you have exist a hardware then many ways to fix it. if not then it is just an article. what can i say.