Some TP-Link products may have more than one hardware version. For example, a name ending with V1, V2, etc. Using the label on the back of the device For most of products Turn over the device so you can see a label on the back or bottom of the unit. Look for a character string next to the serial number, the looks like: “VER X.X”. This is the hardware version of the device. Note 1: The firmware of EU and US are different hardware versions, do not use each other's firmware to upgrade your device. Note 2: Please pay attention to the following 4 models of cable modem that have some special condition. The real hardware version can be found on the left part of the label. But there is another version which is higher than it marked on the right part, which is the version stands for new Visual Interface. TC-7610(US) 1.0, TC-7620(US) 1.0, TC-W7960 (US) 1.0, Archer CR700 (US) 1.0