On this page, you will find the Download link of Wynncom W540 Firmware (flash file), which can be flashed on the device to fix it without the need of any other software.
Wynncom W540 Firmware comes as a zip file and is of 3 MB in size. Firstly, You need to extract the zip file on your computer and flash it using the flashtool.
The file version of Wynncom W540 Firmware is V1 and it was released on 11/03/2015.
File Name: Wynncom_W540_11032015.zip
Alternate Name: Wynncom W540 11032015
File Size: 3 MB
Released date: 11/03/2015