@akaban 

Thank you so much for taking the time to post the issue on TP-Link community!

To better assist you, I've created a support ticket via your registered email address, and escalated it to our support engineer to look into the issue. 

Please check your email box and ensure the support email is well received. Thanks!

  @akaban 

Hey bro 

I have also the same Archer C6(IN) version 4.8 recently bought expecting to be delivered version 4.0 from Amazon I saw many reviews of this router before purchasing and got this version, i first thought it was a fake product as in the TP-link official website the latest version for this model it shows is 4.0 and all the firmware updates are mostly US and EU in Indian website. I reached their technical support team but the answer was not satisfactory. I can't understand if they are launching a newer version why aren't they updating their official website and providing the updates for this firmware separately 

As also got the update that you already installed 

Latest Firmware Version:

1.13.5 Build 240222 Rel.50991n(5553) 

My current version is 

Firmware Version:

1.12.10 Build 230208 Rel.38553n(5553)

Hardware Version:

Archer C6 4.0

One thing you noticed here in the box it's version 4.8 but on the router home page it shows 4.0 if it's based on 4.0 only why is 4.8 mentioned? 

Now I am worried about whether to update it or not as the issues you are facing after updates are the same issues I faced in the previous i.e current version of dropping the internet for a few minutes i first thought it was my ISP issues but now I understand its this brand new TP link new version router issue.

Also, there is another issue I am facing suppose 4-5 devices are connected suddenly 1 device says no internet but the other 3 devices' internet is working 

Plz suggest bro whether I should update it or not as after the update also you are facing issues that they intend the fix.

Thank you