@Yuda 

Good day.

Sorry for the delay.

We would not delete any posts related to the product no matter they are positive or negative except for some advertisement.

As for the speed on Archer T6E, it is not normal and pretty slow comparing with your other devices.

So we might need your help to check more details：

1. How long have you had the adapter and when did this issue start?
2. Could you please help me check the wireless link speed on the adapter, such as https://www.tp-link.com/support/faq/2265/
3. Since Archer T6E is dual band adapter, did you also have slow speed on 2.4ghz as well?
4. Have you tried to change the wireless advanced setting on the C7, such as: https://www.tp-link.com/support/faq/2292/

Thank you very much.

@Kathy_Z 

1. Have this adapter for a couple weeks already, it's been working like that since it was purchased.

2.

3. It seems that this adapter only working on 2ghz and not 5ghz. I tried also to follow these steps for adapter to prefer 5ghz:

• Right click windows logo in lower right bar
• Choose "Device Manager"
• Expand Network adapters
• Right click the "TP-LINK 802.11ac" device and choose "Properties"
• Click the "Advanced" tap and in "Property:" find "Band Preference"
• Choose "Prefer 802.11a"

But it seems that I don't have this option in my settings. Could it be driver issue? Using official driver from TP-Link website (Windows 10 x64)

4. To be honest not sure why i need to change my router settings if all other devices connect properly to 5Ghz and reach ~400-500 Mb/s, while this adapter (which is 20cm away from other devices) manage to reach only 40 Mb/s. It's not router problem for sure. Could it be driver problem?

------------------

Update!!!! I downloaded broadcam drivers and band pref apperead in properties of the device. I changed so it could work with 5 Ghz only and now I'm getting 80 Mb/s which is better than it was.

So apparently it is problem with the drivers. How can I actually make that it would work on Dual-Band?

@Yuda 

Good day.

Thank you very much for your time and patience.

Have you tried to update the following driver:

https://static.tp-link.com/2019/201911/20191129/Archer T6E T9E_ASUS driver_7.35.351.0.zip

thanks a lot.

@Kathy_Z worse than it was.

Should I make some changes in the settings? Is there any other drivers available that work properly?

@Kathy_Z any help?

@Yuda 

Good day.

Thank you very much for your time and patience.

Sorry for the delay.

The speed test was on the 2.4ghz or 5ghz, this time?

And how about the link speed on the computer this time？

May I know the model number of your home router?

Have you tried to ASUS driver that I sent before?

If possible, please also refer to this link to have a try:

https://www.tp-link.com/support/faq/709/

Thanks a lot.