For the test I’ll take TP-LINK TX-6610 Ver: 2.0
First of all we download the firmware from the official site http://www.tp-link.in/download/TX-6610_V2.html
If the version of the device is not 2, then you need to select the required firmware, otherwise the firmware may be corrupted.
Let’s manually assign an IP address, for example 192.168.1.2, to the computer and open 192.168.1.1 in the browser, the same login and password are admin.
In the opened interface TP-LINK TX-6610 we choose “Management” -> “Firmware Upgrade“, click “Обзор“, specify the firmware file and start the update process by clicking “Upgrade“.
In the process, you can not turn off the power categorically, at the end the device will reboot itself.