To update the software on a UniPing v3 device, you must:
1) Download the latest firmware from the official website
http://www.netping.ru/products/uniping-v3
2) Open the device’s web interface through the browser, enter the login and password, select the “FIRMWARE” tab.
3) Drag the downloaded file with the mouse into the browser window where it says “Drop the firmware update file with the extension .npu here”.
4) Press the button “Pour firmware”.
Next, you need to wait, the firmware file is loaded into the device and the update process is completed.
See also my article:
Configure and use NetPing / UniPing devices