@SyedShafiulIsla 

Thank you for your question. I understand that you are using a Deco Mesh system in Bangladesh and are unable to select the 160 MHz channel width option for the 5 GHz Wi-Fi band. You would like to know if 160 MHz bandwidth is supported in your region and if there is any way to manually enable it.

Please note that the availability of 160 MHz (as well as 240 MHz or 320 MHz) channel bandwidth on the 5 GHz or 6 GHz bands depends on local regulatory restrictions. In some regions or countries, including Bangladesh, certain bandwidth options like 160 MHz may not be available due to these regulations. This is why you may only see up to 80 MHz as an option in your Deco APP settings, and the 160 MHz option is either not visible or not selectable.

If the 160 MHz option is not available in your Deco's firmware for your region, it cannot be manually enabled, even with a firmware update or advanced settings. The device will comply with your country's wireless regulations, and these restrictions are enforced at the firmware level to ensure legal operation.

If you need further confirmation or have additional questions about regional support, you may contact TP-Link support with your device's model and current firmware version for more details.